Honkai Impact: Chief Assassin, Step Sister Sora Herrscher

With the help of the chief shadow assassin of the Chinese Assassin League [Mio], the second Herrscher Siren was eventually killed. In order to realize his plan, Otto used cloning technology and the Herrscher Core to resurrect Sirin again, but there was a slight problem with Sirin's soul. There was no other way, so Otto had no choice but to entrust Mio to take care of him. It's just that letting an assassin who only knows how to kill take care of a child... Seriously?