Ai-chan, also known as Aiko Morimura, is a slightly sentimental girl in the second year of junior high school. Dad went out on a yacht 10 years ago and went missing. The mother of the hat designer is going to Paris, so she moved to her dog Papi and Fujinami's uncle's house. However, Papi dies in a traffic accident. At that time, a rare dog Spank appeared. Clumsy and ugly, but thanks to the nice punk, a smile returns to love. It's a little strange dog, but it was Aiko who had a little expectation for her new life.

Aiko, who started living at her uncle's house, can make friends with Ryo-kun and a good classmate while doing so on Span's failure. One day, Rei Ikegami, the younger brother of the Spunk's owner, came to pick up the spunk. Spank, who was taken to Tokyo, spends his days being helpless. One day, a package arrives from Aiko. It was a backpack that was forgotten by Spank. Because of that, Spank's feelings for Aiko have increased and decided to leave home. I'm going back to Aiko. I wonder if Spank will be able to get on the train, hitchhiking, and meet Aiko again...

Ai-chan's new semester has started. Although I have a rich daughter who I don't like in my classmates, I'm happy to be able to study in the same classroom as Ryo-kun and Shi-chan, but by chance, Spank caught a cold and I took a break from the second day. Spank felt responsible and decided to go to school instead, but instead of acting as a substitute, the classroom made a big fuss because of failure. Spank who doesn't have a face to match Aiko thinks about leaving home...

Spunk fell in love at first sight with Siamese cat owned by Seri Mihara. In order to show a cool place, I go to help Cat who is attacked by a stray cat, but on the contrary, she gets killed and gets fed up. Spank inspires him to become an attractive man. With Ryo's friendship that inspires in the same way, what is the whereabouts of Spank's love? ...

Always cute Cat. It was a punk who applied for a date with that cat, but Torakichi, a love enemy with a red tie, proposed to me, so the punk was also slod ... However, Oshima, the captain of the judo club, who owned the Torayoshi, suddenly saw Aiko for the first time. Oshima's love letter operation started. Spank was chosen as the messenger of love. It's a punk that can be treated a lot, but...

Ai-chan has been strange lately. When it comes to Mr. Ikegami, he's bored and suddenly happy, and it's kind of strange. There, two people who somehow spark with the appearance of Seri. Spank and Torakichi are also playing around cats. That's why Torakichi went into the sea. Spank jumps into the water to help in a hurry, but actually Spank couldn't swim either! ...

Aiko, who promised to meet Rei a week later, is wearing a bandage on her finger-cut little finger. Aiko, who makes Rei think about her, seems to be somehow happy every day. But on the promised day, Ikegami brought a very beautiful woman. That woman, Aiko who is conscious of Kaori Mizukoshi. Spank noticed Aiko's gesture and tried his best to do something for Ai-chan, but...

Rei Ikegami's yacht meets a storm and goes missing. Aiko is worried. Aiko tries to look for it while getting wet with a spank in the rain, but she is driven back by Genji at the yacht harbor because she doesn't have to worry. The next morning, Rei is found, but unconscious. Aiko rushed to the hospital, but she can't meet her due to her visitation. However, with Spank's strategy, Aiko succeeds in waking Rei. Aiko confirmed her feelings for Rei, who couldn't stop herself.

The next day, when Aiko visited the hospital, Rei Ikegami was transferred to her father's hospital in Tokyo. Aiko with all her heart that wants to meet Rei. Spank, who has lived in the Ikegami family before, says that he will guide him to the hospital. Although Spank was dodge, he took Aiko and her friend's department to Anka Ikegami Hospital. In that hospital room, Aiko is attacked by Rei. " My father is trying to get rid of the yacht. I want you to protect that yacht somehow." And. The next day, Aiko was looking for a yacht, but there was no yacht anywhere...

Aiko is constantly worried about how she told the fact, not to the shock that Rei's yacht was burned. I didn't know Aiko's heart, and I got many calls from Rei. It's Aiko who uses spunk and makes sesame seeds every time. However, in disdain with Aiko's feelings, the fact was told by Rei's father. Rei becomes bikun for a moment... I didn't listen to my father's stop and went out to some place. Rei's figure was once in the yacht harbor in the town where Aiko lives. But one day, it disappears completely. Aiko is struggling with new worries. Where has Rei gone? ...

A trip to the plateau ... In addition to Aiko, Shinako, and Ryo, even Serinno got on the same train. Apparently, Spank was set up for romance with Cat. As usual, after a rare disturbance, I arrived at Tateshina anyway. It was supposed to be a fun plateau day, but Cat went missing due to Spank's mistake. John, the collie dog of the ranch, saved her. Cat fell in love at first sight with that male figure. A spank that drops his shoulders. That evening, Serino invited everyone to a barbecue. Spank became desperate and ate it...

Aiko and others have a good time with Rei's separate delivery from Tateshina Plateau. Only one punk feels a little tight. Because the longing cat is passionate about John, the collie dog at the ranch. At that time, Rei's father silently ran out of the house and came to pick up Rei who never came back. However, Rei refuses to meet her father. " I hate Mr. Ikegami like that!" And Aiko's slap will fly. Why did I do such a thing to my favorite Rei, Aiko cried and got wet alone...

Rei decides to study in Vienna to realize her dream. The departure is in a week. Ryo and Shinako feel like being pinched by a fox by Aiko who doesn't look sad. However, Aiko, who strongly recommended Rei to go to Vienna, was alone. On the other hand, Spank is passionate about wanting to be a police dog. This is also the spirit of trying to turn the heart of Cat, who is still in love with John, the guard dog of the plateau ranch. Aiko's big uproar. And on the day of departure, the dramatic separation between Aiko and Rei...

It's been a few days since Rei left to study in Vienna... Even Aiko, who is strong, can't hide her loneliness. Aiko spends her time alone every day. I can't see such Aiko, and Spunk tries to attract her with her own hands. Then, Aiko's mother came back from Paris. Aiko immediately regains her smile. Spunk is not interesting this time for Aiko, who is always sticking to her mom. And mom suddenly brought up an unexpected story...

Aiko is going to Paris with her mom...?! At first, Spank was dreaming that he could go to Paris with me, but when he knew that he wouldn't accompany me, his heart was disturbed. Torakichi and Oyama are comforting and encouraging such a punk. " If you're a man, stand back!" Spunk finally became interested in Oyama's words and disappeared from Aiko's presence. After wandering aimlessly in the intense thunderstorm, the mansion that finally escaped was Seri's house. That's where Spank learns unexpected facts. Will Spank be able to return to Aiko...? Or will Aiko go to Paris and break up with Spank...?!

Aiko and Spank play happily in the summer sea. Then a puppy that looks just like the dead Papi appeared. On the other hand, Aiko meets Seiya Tsukahara, an unidentified boy. However, this Seiya was hateful, and as soon as I met her, she had a big fight with Aiko. And he was the owner of a puppy (Baron) similar to Papi. Aiko is somewhat depressed for Spank, who is overjoyed to have a new younger brother. That's right, Seiya moved from Tokyo and became a student in the same class as Aiko. " Nice to meet you, seaweed hair" Somehow difficult mood in the future.

Aiko and Seiya Tsukahara, a transfer student, are still in a fight if they meet. Despite the conflict between the owners, Spank and Baron seem to be brothers, and they went out to the city today as well. Aya, a mysterious woman (actually Seiya's older sister) appeared there. The next day, there was a strange rumor that Seiya lived with a woman. Because of that, Seiya will confront Banchozan. But I know that the rumor is a terrible misunderstanding. Seiya is hated again when she is beaten by Aiko who rushed to help. Aiko could understand Seiya's heart hidden behind those words...

Aiko was taught archery by Seiya Tsukahara. However, even if Spank has mischieved and broken the bow, Aiko doesn't have enough savings to buy a new one. Spank tries to work part-time and buy a bow. Staying at home, and selling ice cream, but it doesn't go well. When Fujinami and Osaki saw it, they knew the feelings of Spank and gave him money. Spank is overjoyed to buy a Western bow and deliver it to Seiya Tsukahara. Seiya allowed Aiko to practice again because of the hardships of Spank. Thanks to Spank!!

My uncle is reading a detective dog's achievement article in the newspaper. Everyone who praises. Spank with narrow shoulders. So Spank starts a nearby dog and a detective Gokko in order to take credit. However, Spank is full of failures and only disturbs the surroundings... Aiko is also very weak. However, it turns out that the tea peddler who aimed at the suspiciousness of Spank was actually a robber No. 5 and is praised by the police. I'm good at spank! ... Aiko reviewed it a little, but I thought Detective Gokko was already stiff.

Spank and Barron were tled by a great bull on the beach. When I try to escape, Baron gets caught. A helpless spunk. And Jack, a cool one-eyed dog, appeared there and helped me. That dog was the old dog of Grandpa Gen, the manager of the harbor, and was sent to Hokkaido five years ago. Over the long years, while falling into a drifting dog, we were all touched by the sight of Jack who asked for the source and there was no voice. One day, the yacht of Seri was washed away. At this rate, it will be life-threatening. Jack made himself in the rough sea!

Today is the day I go to school during summer vacation. As usual, Spank and Aiko, who are going to school, encounter Seiya, who is playing a big fight against delinquents on the way. It was Spank who was so strong that I couldn't help but be dazed. At that time, Aiko's student ID card, which fell on the road, forced Seiya and Ryo to have a duel. The place is going to settle by swimming far to the sea - a large rock off the coast. Aiko and the others stop them, but Oyama, Nezu, and even Spank are the ones who make them two of them, so they finally jumped into the sea...

Today is Seriano's piano recital. Spank, who was forced to stay at home due to Seri's strict order, looks dissatisfied. However, suddenly, I can make plans for a visitor to Fujinami. Aiko is at the presentation. Fujinami is stuck in the atelier. Saki, who is chased by the preparation of the visitor alone, dances. Therefore, Spank "efforted" to help with the stigma of "helpful", so things became troublesome.

Aiko suddenly came up with an idea and said she wanted to work part-time. The guest house Daisenso was so crowded that I wanted to borrow a cat's hand, so I decided to use it as a boat to cross. I immediately got on board with Spank, but it's not as easy as I thought it would be. Also, the seri forcibly cuts in and is amused to help unfamiliar, so the big mountain villa is immediately in chaos. It was like they didn't know if they were helping or if they were fighting things.

On a stormy night, Aiko just dreams about her dad. The next day, when I saw my best friend, Konako, was with my dad, I also want him to be by my side. Then, a mysterious man with sunglasses appeared. Aiko feels very nostalgic for the man who smells of the sea. Aiko goes out to the sea the next day and searches for the man. Ryo and Seya around him are worried and tell Fujinami about it. I found out the other facts there. The mysterious man says to Aiko that he is his dad. Did you really get your dad!? Aiko's heart shakes...

An old classmate comes nearby at the summer training camp. The homeroom teacher that Aiko admired is also with me. Aiko is looking forward to the reopening. However, when I met him, I was informed that the blank space of less than six months was surprisingly large. On the other hand, Spank, who was enthusiastic about the whistle of birds, found a wounded seabird. And as a result of the generous care of Aiko and Spank, the seabird flew back to the group safely. And my old friends also left something in Aiko's heart and went back to Tokyo. Somehow lonely, somehow missing people, the end of summer...