Invited by Teratani to a study camp by the sea, Kazuki meets Izumi Isozaki, a girl standing alone on a rocky beach!　He is shocked and depressed by her disdainful gaze. Izumi tells him about a 51-stone spell that protects their love, and he decides to pile up the stones on behalf of Izumi's ex-boyfriend. And the last white stone he piles up is...

Kazuki hugged a sobbing Itsuki. Since then, he is confused by his wavering feelings. The photography club decides to organise a contest and Iori is chosen as the school's representative, but it is a trap set by Samejima and his friends, who were expelled from school for a voyeurism scandal. Iori is in danger in her swimming costume in an abandoned building. Kazuki, who was on a date with Itsuki, learns of Iori's danger and heads for the abandoned building. Then Itsuki decides to make a serious confession...

The day of the Christmas party finally arrives!　Kazuki confesses his feelings to Iori, but the drunken Iori doesn't understand his true intentions... Then, the after-party. Thanks to Teratani's consideration, Kazuki and Iori are left alone together. Kazuki is surprised to hear from Iori that he has been accepted into the theatre company. Meanwhile, Iori has to attend an audition at short notice at the request of the office..! Kazuki is unable to tell Iori how he feels about her, and his feelings are becoming more and more urgent. In a mood of resignation, he gets on the train home with Iori, but the opportunity comes unexpectedly..!

Christmas Eve night. Seto Kazuki was walking through the illuminated streets with his best friend Teratani. Today, they're at a Christmas party with Iori Reedzuki and Morisaki. Kazuki fondly remembers the time when Iori was still only an admirer. The spring of his second year in high school, when he could only stare at Iori practising in the drama club...