Itoko no Oneechan ni wa Natsukanai!いとこのお姉ちゃんには懐かない！; Itoko no Onee-chan ni wa Natsukanai!; I Won’t Grow Fond of My Big Sis Cousin!; I Won't Get Attached to My Big Sis Cousin!

In order to be accepted at a school with high academic standards, Masato has to take lessons from his "big sister" cousin who is too sexy for him! Can he overcome her temptation and concentrate on his studies? The heart-pounding study session begins under one roof!