第 4 集: 麻子對小一在由美身上毫無進展感到煩躁，卻無視自己的情書。

4

It's been a month since everyone went to the karaoke box together and Mao is annoyed at Kouichi, who hasn't made any progress with Yuumi. Meanwhile Mao has been receiving a lot of love letters recently but she only considers them to be a nuisance. (Source: Wikipedia)