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Hiro is preparing for a festival that's about to be held at her shrine.

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Nagi and Erika are trapped in a hotel room by her mother, who seems to be playing with them.

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The world now knows the face of singer Mochizuki Ai, who created the song “Arc Fault.”

Hiro is kidnapped and Nagi immediately sets out to save her.

Nagi is suddenly hit with the truth about Ai’s real objective.

On the day Nagi, Erika, Sachi, and Hiro are to return home, Nagi and Hiro decide to stay behind to collect a shrine stamp from the local temple. However, become of this, their train ride home is canceled due to the stormy weather, thus forcing them to stay at a local inn where things get strangely intimate.

Hiro moves in with Nagi, Sachi and Erika. Friction arises, but they're reminded of what happiness might mean.

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Nagi is hoping to do the test of courage with Hiro, but Erika takes him instead. Nagi can’t figure out what it is that’s bothering her.

Erika reveals who it is that she’s been trying to reach through social media.

Nagi discusses with Erika what he learned – or tried to learn – from her father.

Having topped his grade in the term exams, Nagi confesses to Hiro once again.

Sachi is worried about Hiro, so she brings Erika along to follow her and learn about her.

Erika, Hiro, Sachi and Nagi make plans to study at Erika’s vacation house, but there ends up being a slight change in the roster.

Erika, Hiro, Sachi, and Nagi spend more time at the beach home retreat, and eventually, clues about Erika's missing older brother are found. This incites Nagi to search for him around the nearby town with Erika by his side.

Umino Nagi was swapped with another child at birth. He’s going to meet his real parents today, but on his way to school, he meets a girl who is threatening to die to get out of her engagement.

Erika joins Nagi’s and Hiro’s morning study sessions to wingman for Nagi, and Hiro wants to come hang out at her place.

Nagi and Erika are now engaged, but Nagi can’t wrap his head around how loaded Erika is, and Erika seems to have concerns of her own.

Living together with Erika gives Nagi an opportunity to focus on exam prep, except when they run into trouble.

Having scored higher than anyone else in his grade, including Hiro, Nagi decides to finally confess to her.