Takuma Sakamoto is legendary inside the MMO Cross Reverie as the overpowered Demon Lord Diablo, and he's pulled into another world wearing that exact same face. When two summoners, Rem Galleu and Shera Greenwood, try to bind him as their slave, his reflexive skill Magic Reflection turns the ritual back on them instead. This light novel follows Takuma leaning into the Diablo persona to hide just how out of his depth he really is with people.