Years have passed. Things have changed. After a surprising call from your twin sister, you decide to head home to see what the hell is going on. And you certainly didn't expect that.

NEET-chan and reserved girl. A bit shy, but an obedient girl. Something happened in the past and luck seems to have turned her back. I know nothing about pranks due to lack of life experience and

A Western-style building that stands quietly in the mountains, the Black Rose Museum ... Ryohei Takamiya, a university student who will stay there for a week as a tutor, triumphantly visits the museum.

The main character, "Arcy," is a student of an innocent young lady magic school who was sent to an isolated island during the attack on her house . Her magical device, which is a black box,