She's an old classmate of Ryou and Masuda.
Ichika Arima
有馬一花
Ryou Amakusa
天草亮
Masuda
益田
Kai Tamaru
多丸快
Rio Amakusa
天草理緒
Arie Matsushima
松島有枝
Ruri
瑠璃
Yuriko Arima
有馬百合子
Classmate
Taniguchi
Ryou's Ex
Ryou's coworker
Bartender
Yamakishi
Doukyuusei
同級生
Wedding Guest
Kotake
小竹
Suzuki
鈴木
Groom
Satsuki
