Yuuhi isn't feeling well and stays home from school. What started as confusing feelings that morning finally becomes a true confession. However the emotional conflict is not over since there are others whose feelings warrant consideration.
It's the school Cultural Festival and Yuuhi, Karen, Fuyuhiko and Tsukasa (along with the rest of their classmates) are doing a Yakisoba café. However, they face tough competition from the Yakisoba stand put up by Minato and the tennis club.
Karen Ayanokouji, Jun'ichi's classmate, invites him and his class to her party. He is dragged along by Minato. When they arrive, Jun'ichi, Yuuhi, and company find that the party is actually a formal event on a huge cruise ship.
Jun'ichi's teacher Sugishita goes missing in an abandoned portion of the school. The student council president enlists Jun'ichi and his friends to search. While searching Jun'ichi and Yuuhi fall down a trap door into a pit.
A scene from Yuuhi's past provides some background on the arranged marriage. Yuuhi and Jun'ichi have trouble adjusting, and Yuuhi spends her first night on the couch. Yuuhi and Minato spend time together and become better friends.