You Don't Want to Mess with Monster Girls

A young man transmigrates to another world and unexpectedly “meets” a monster girl, beginning an enviable harem life.

Asuna, my king...

P.S. Of course, the above is just a fake synopsis (there's no reason it can't be fake...).

No cliched story about a young man meeting a girl;

no harem;

even the transmigration is fake...