One night an android which looked like a cat (a Necossass: Six type) suddenly appears in Katsuhiko Katsu's room. The android said that she comes from the 22nd century and that Katsu had left a note in a time...

When the weak and unconfident Choi Yikyung first found out that he was a user, he thought he had finally hit the jackpot. In Yikyung’s mind, Necromancy seemed like the ultimate mix of cool and interesting....