Unusual circumstances forces Yuta and Rikka to live under one roof. Keeping it under wraps is top priority as the new school year starts.

Nibutani becomes obsessed with the state of Yuta and Rikka's questionable romance, and pressures Yuta to take control of his girlfriend and lead her down the righteous path of boy-girl relationships.

Rikka becomes very excited about the presence of a magic user she is supposedly doing unvisible battle with, but it soon becomes apparent that this magic user is an actual person. She is a girl Yuta knows from his middle school days who first infected him with chunibyo. Rikka is both fascinated and terrified of the threat the new girl poses to her and Yuta's love contract, and either wants to be friends with her or be rid of her for all eternity.