It is quite common in Japanese movies for a girl to confess her feelings to the guy but in this movie, what makes it different from the rest is that the girl confesses her feelings to the guy who is in a serious relationship. She wasn't hoping for her feelings to be reciprocated so she asked for their friendship to remain still after that.

This isn't a movie where a girl pathetically and annoyingly chases after the guy whom she has feelings for. This is a movie where a girl appreciates being friends with the guy and doing things to sincerely support him.

The movie successfully show that love isn't all rainbows and glitters. You have to face unexpected storms in order for you to grow stronger. Along the way, feelings might be unknowingly suppressed but it would soon be acknowledged because the people around you will remind you.