I Was Just an Only Child Boy, Now I Became One of a Four Quadruplet Sisters Toharumina,とはるみな

In the bon festival which had the hottest temperature of the year. Yuki Morishima was working in a humid room with no air conditioning for the sake of a black company. When he tried to take a break he collapsed.
But when he woke up next, he became a girl, became a baby, became a part of a quadruplet. With identical girls.

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