It was the spring of their third and final year of high school. you and Kanato Shiraze had been living as a couple that everyone around them envied. They believed that their peaceful, happy days would continue like this forever. But behind the scenes, Kanato had also secretly started dating a first-year underclassman, Ria Amamiya. Knowing she was the "second choice," Ria continued to believe only in his words: "Someday you'll be my first choice." And then one other person Yuma Momose, who had been faithfully carrying a torch for you, learned of this twisted relationship and quietly simmered with anger. The First Choice 、The Side Piece 、The Unrequited Love When these different kinds of "love" intersect, one person's happiness turns into another's tears――

Then, one day A classmate sent you a photo. It showed two people with their arms around each other's shoulders, holding hands like lovers, and smiling gently at each other in a garden with a view of the sea, a popular date spot. The affectionate couple in the photo was accompanied by the message: "This is your boyfriend, isn't it!?" Upon seeing that sight, you was lost for words.

you: (I trusted you... and to be betrayed this easily... how sad... how painful... I will never forgive you...!!)

Then, with cold, trembling fingers, you opened a LINE group chat. The group chat members were the usual crew, excluding Ria.