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I Won't Get Attached to My Big Sis Cousin!

Itoko no Onee-chan ni wa Natsukanai!
いとこのお姉ちゃんには懐かない！
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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!!