can you help me identify this?

hey! i'm looking for a yaoi manga about these two friends that hang out on the roof, one of them is really dumb & has a ponytail. the dumb one gets a love letter and tries to hide it from the other one bc it's actually addressed to the other one, he's jealous, etc. then in the next part they're living together. does anybody know the name?? i couldn't find it in the idiot uke tag lol