Alright, watched ep1, I'll give a brief summary/spoiler, it's only the first ep so I don't think it'll ruin it much

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Tsukamoto Tenma is a 2nd year in high school who has a huge crush on a boy in school, Karasumaru. But when she finally ended up in the same class as he, she finds out he's going to transfer away. So out of desperation she with him a love letter (more of a love epic) to confess her love but forgets to sign her name on it. Karasumaru reads it and decides to stay for another year. On the other hand, Tsukamoto does not know that she is loved by another guy, Harima Kenji. He's a delinquent that gets in fights all the time but is misunderstood. He writes a love letter to Tsukamoto to ask her to meet him behind the gym, but unfortunately, he is also challenged to a fight behind the gym, confusion ensues, Harima fails to confess his feelings.
So I'm expecting this comedy to continue about Tsukamoto and Harima trying to harder to declare their love as the relationship between the three people developes. Ah, it's so much funnier to watch it yourselves instead of reading what I write, so go watch it.
BTW, the ending song is really catchy. ^_^