The Host Club participates in the annual school festival. Tamaki's father and grandmother turn up there. However, the arrival of Eclair Tonnerre, a woman who Tamaki was told to take care of by his grandmother, brings an unforeseen turn of events. Haruhi also learns of Tamaki's history, and his entrance into the Suoh family.

The Host Club must race against time to keep Tamaki in Japan and save the club from disbanding. However there are a few bumps along the way, as well as a wild horse ride, fighting with Ootori family police and Grand Tonnerre taking over lots of businesses. After Hikaru gets hurt, Haruhi rides the carriage and runs after Tamaki. Haruhi convinces Tamaki to return to the Host Club and reaches for his hand, but Tamaki is stopped by Eclair Tonnerre. Haruhi falls from the carriage and off a bridge. Eclair lets go of Tamaki's arm and Tamaki thanks her before jumping from the car to save Haruhi. In the end, Haruhi, dances with all the members of the Host Club.