Ep. 19: Mina feels lonely and depressed while Riku is away in Hokkaido.

19

During a school trip to Hokkaido, Mina becomes isolated and depressed after Riku fails to reply to her messages. Riku remains unaware of her distress, mistakenly believing that Sayuri and Sakurai are dating, which leads him to ignore her attempts at contact. Upon returning home, Riku finally accesses his phone and discovers a large volume of unread emails and texts. He also listens to a distressing voice message from Mina, which reveals the depth of her emotional struggle and loneliness during his absence. This discovery forces Riku to confront the reality of Mina's situation and his own misconceptions about her feelings and the social dynamics surrounding her.