During the school entrance ceremony, student body president Kazu is reunited with Hideki, a younger guy he used to hang out with when they were little kids. The formerly eccentric Hideki's grown into a fine young man, but now he's acting cold towards Kazu. That's because long ago, when Kazu saw Hideki's dad having sex with another man, he hurt Hideki by saying, ''That's disgusting......'' At the time, Kazu hadn't known that Hideki was trying to tell Kazu he loved him and had taken Kazu's remark as a rejection! Now that Hideki's cleared up the misunderstanding, he's become an uncontrollable puppy-dog that keeps following Kazu around......!
入学式の日、生徒会長の和は小さい頃可愛がっていた年下の幼馴染み・秀樹に再会した。ませた変な幼児だった秀樹は意外にも立派に成長していたけれど、和に対してやけにそっけない。それは昔、男に抱かれる秀樹の父親を見てしまった和が、「気持ち悪い」と言って傷つけたから……そう思っていた和は、知らなかった。実はその時、幼い秀樹がどさくさに紛れて和に告白し、ふられたつもりでいたことを！　長年の誤解がとけた秀樹は、しつけ不能のバカ犬となって和にまとわりつきはじめ……!?