From Osuwari Team:

Mitsuha is sick of her stupid friends and boring school life. All she wants is to be left in peace. One day by mistake she becomes penpals with Haru, whom she doesn't know at all. Only with him can she be honest. There's one guy in Mitsuha's school who's just the way Mitsuha would like to be - cool, a little scary and above all - alone. One day she meets him in a bus… What will happen next?

*NOTE: The mangaka, YAMAMOTO Keiko, decided not to draw for this manga series anymore after it went on a hiatus since the seventh issue of the Margaret magazine. Another mangaka, NAGI Michiko, will continue this manga.