Between a 3 and 4. I'm going to settle on 3 cause it didn't blow me away despite it still being solid.

Basically Sakura was saved a year ago while she was on a train by a mystery person. As she goes to school she meets a boy name Saku, who's brother is named Ryo. Ryo is the first name of the person who saved her so she badly wants to give him a letter. But Saku might be catching feelings for her, but will Sakura aswell?

Cute and fun. The dialogue is the strongest part, the characters feel real. But the plot hasn't gone to anywhere too new or interesting but this is the first volume. So let's see how it evolves.