When Protagonist Tokiwa Yuu wakes up, the room where the ceiling not got used to seeing extended. And, he sees the mirror and screams.
[I why... It becomes a woman?]
Moreover, it is an appearance of Arina who is the cousin that reflects in the mirror.
Yuu by the experiment of grandfather's suspicious machine, it became a constitution that the body is replaced with the cousin sisters.
The machine breaks by the experiment though it tries to return at once, the reason is not understood why it was replaced. Yuu helplessly, it will spend as a girl while having changed places for a little while...
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