ITOKO NO ONEE-CHAN NI AMAECHAU?

Itoko no Onee-chan ni Amaechau? summary:

***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!!
(Source: Ultra Jump)
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Serialization published in Ultra Jump starting in the June 2024 issue, released on May 17th, 2024.

***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, li