Sayori and Monika had been dating for almost a month...but Sayori hadn't told Monika about her depression until...

Hardships are things that you expect to go through while in a relationship. So why was Natsuki and Yuri going through them even though they're just friends? Or maybe... more than friends? Their relationship may have indefinitely changed during the sequence of events that has happened throughout life. (Also Monika and Sayori are here)