Kyoko Haze is what arguably you would call a tomboy; she enjoys video games, often picks fights with boys every after school, and often man-spreads while wearing a skirt everyday.
Failing all her final exams made her question her question the purpose of her life. Dreaming, Kyoko meets an old man and asked her about her plans in the future, all of a sudden, she wakes up in a body of a fair, young Russian man! She gains abilities she had never had before; being able to accurately aim guns, name all the different planes from the 40's, and so on. Kyoko can change between her new and original appearance by headbutting!
Everything becomes more problematic in Kyoko's life when she starts having deja vu's and flashbacks, which may have been her past memories as the young man. Kyoko starts to mix her current and past's realities!