Adachi has always had a crush on Tachibana since they met but it goes unrequited since Tachibana thinks Adachi stole all his previous girlfriends, more painfully the first one whom he went out with for half a year. He doesn't realize that Adachi was only trying to copy Tachibana's warm smile and attitude which made him too popular and thus made the girl come to him on her own! This causes Tachibana to resent Adachi for years until one drunken night Adachi and him do something wild (mostly driven by Adachi). A very cute story
Warawanakute Ii Noni