第 21 集: 嫉妒爆發？船上的兩隻愛鳥：顫抖

21

Naru and Keitaro decide to go out to celebrate the latest grades and while both are wondering whether it's a date or not, a mysterious little girl appears.Mutsumi also states that she is trying for Tokyo U because of a promise she made while she was still a little girl, but can't remember the name or face of the boy, hinting to the fact that she might be the girl that Keitaro made the promise to. (Source: Wikipedia)