Fuyuki and his younger brother Haru ride the bullet train. Fuyuki stands in front of his brother, who sits on a seat with a handful of sticker sheets while sticking stickers on his little self.

His cold eyes see the girl next to Haru sneakily taking one of Haru's stickers and sticking it on her hand. When he was about to confront her, Haru smiled and handed her a sheet, "have it, big sister!" to his surprise, they both began to put stickers all over themselves.