My love is someone else's――... The final decision!! The perfect honor student, Suyama Seira, falls ill and decides to undergo a brain transplant from a male middle school student. After the surgery, she can't stop having lewd thoughts about her best friend and the women around her...!? After learning everything about the brain transplant from Naho, Seira resolves to tell Tomo-chan her secret. Is the love she feels for Tomo-chan truly her own, or is it the donor's...? And is there a way for her to return to her original self!? What path will Seira choose after learning the truth...? A forbidden high school girl fantasy comedy, the final volume!!