Kyosuke's interest in Kei wasn't straightforward, Kei ruins Mikyako and Hirono's date, Renji and Chihiro sneak into the library.

Chihiro finishes her novel and agrees to go out on a date with Renji.

In the past, Yuko continues to go through being bullied, and this time she fights back, but gets injured in the process. Yu starts worrying about her more, and is angered that her older brother does nothing to help Yuko. In the present, Kei has a talk with Kyosuke about Chihiro, and he suggests that she go and visit it her. When they meet again for the first time in five years, they make amends with the past, and reflect on their futures with those they love. Mizuki wants to be stronger like Chihiro and Kei, but does not know how. When Mizuki expresses this doubt to Nagi, Nagi reveals that she is in fact going out with Kuze.

In the present, Kuze receives a letter of challenge from Mizuki which draws him out of his home to the Otowa Academy school roof to meet Mizuki. Through her professing words of love to Kuze, he finally gives in and wants to stay in love with Mizuki, but his heart gives out again. Mizuki receives emotional support from Kei, Chihiro and Hiro during this time. Kuze decides to have the risky surgery to try to live longer with Mizuki.