A heart-pounding new life together with my "big sis cousin"!?

Masato Ooizumi just entered high school and he finds himself staying with a relative. Living there is his "big sister cousin" who's being way too close with him!? A slightly naughty, living together romcom begins under one roof!!

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!

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