The protagonist discovers that he lives in a world where BL romances happen and learns that his brother, Ayato, received a love confession from his best friend. On his way to university, the protagonist avoids interacting with others, causing Kuroda and Yūki to bump into each other and fall in love. During lunch, his friends Ryōta and Tōma fall in love.

The protagonist is invited to a drinking party by his classmate, Sakita, who also invites lone wolf Kaji, broken-hearted Akihito, and Takimoto. By the end of the evening, Sakita and Kaji fall in love while Akihito and Takimoto become a couple.

Ayato invites his friends over, including Tōjō, the person who confessed to him. The protagonist discovers that Ayato and his friends have a complicated love square relationship.

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The protagonist is invited to a group blind date by his classmate, Misaka. Uchiumi steals the girls' attention but expresses interest in the protagonist, causing the protagonist avoid him and have him pair up with Misaka instead. After the two men leave, the group date becomes a failure as the girls have lost interest.

The protagonist meets Mayama, who is secretly a BL manga artist, but avoids him. Mayama, who is a fan of male relationships, decides to watch over the relationships of other men, observing Hikaru and Shun falling in love and wishing that he lives in a world where BL romances are common.

Ayato realizes Tōjō is serious about him and starts to realize his own feelings for him when they become distant. The two make up and begin dating.

The protagonist finds chocolate for Valentine's Day in his bag and later realizes they are from his classmate, Kikuchi. To avoid him, the protagonist has him sit with Miyoshi, only to have Miyoshi's boyfriend, Haruo, interrupt class.

The protagonist gets drunk and falls unconscious, but he learns that Kikuchi had carried him home. Kikuchi confesses to the protagonist that he has been in love ever since the protagonist spoke to him when he was feeling upset. Despite conscious efforts to avoid Kikuchi, the protagonist eventually gives into his feelings for him.

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Mob knows the golden rule of this world: chance encounters ignite romance. He suddenly starts working out, but an unavoidable contact situation arises, leading to...

Amidst the intense and bittersweet cosplay battles at a Halloween party, Mob finds himself captivated when a perfectly adorable Little Red Riding Hood appears before him. He can't help but be drawn in, but...

Mob, who has a sense of smell so sharp he can guess an entire breakfast menu just from the scent, detects the "scent of love" from classmates at university who are using the same shampoo fragrance. But...

In this world where even the cafeteria has handsome older men, Mob encounters a crying middle school girl... no, a cute middle school boy on his way home.

Out of the blue, an unfamiliar high school boy named Hatano appears before Mob and confesses, "I like you." Hatano then begins sharing an unforgettable memory, asking, "Don't you remember me?"

To avoid the powerful "flag" that Hatano represents, Mob devises various plans to pair Hatano with his brother Ayato's (#Yutaro) friend. However, things don't go as smoothly as he hopes...

Hatano calls Mob out, saying, "There’s something I want to talk to you about." Revealing that he is underage, Hatano declares, "I’ll confess again in three years," before running off.

Mob visits the high school festival where a group of boys is performing "Cinderella" on stage. With a camera in hand, Mob waits for his younger brother Ayato's turn to perform, but...

There are many ways two people fall in love, from sharing an umbrella on a rainy day to moments of tipsy spontaneity. Mob casually asks Ayato how he and Tojo ended up together, but...

"Could you help me out a bit?"—this simple request for assistance marks the beginning of a BL story. Mob, who had been keeping a low profile, finds himself asked to be an extra in a certain filming project.

Mob and Hatano reunite unexpectedly. Due to an accident, they suddenly find themselves cast as the lead characters in an independent film. Mob is bewildered by his sudden promotion to a main role, but...