Relationships are like flowers, Look after it and it can grow and blossom into something so beautiful but also so delicate that even a single touch can break it on the other hand if you don't look after it, it will die and perish into an unrevivable thing never being able to be fully healed.
Yuri has been receiving love letters from an anonymous person and it is soon clear for her clubmates the purple girl is falling for the person behind these even when she doesn't even know their name. However, the mysterious writer may be closer than expected.