The anime is a gender-swap isekai in which a gamer guy wakes up in a computer game as a female.
In a twist to the usual isekai, and as the name hints, one of the two guys summoned to the fantasy world is transported into a woman's body.
Seventeen-year-old Hajime Nagumo is your average, everyday otaku. However, his simple life of pulling all-nighters and sleeping in school is suddenly turned upside down when he, along with the rest of his class, is summoned to a fantasy world!
Okay, we all know the isekai format by now. The hero travels from our world to another. Sometimes they die and reincarnate, and sometimes it's a computer game.