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.

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.