Review Detail of XKoa in Leave Me Alone, Heroines!

Story could have been a great adventure of a man who had to come to terms with his past life while dealing with a new world and yandare fml but it was instead weird perversion of the author who thought having the assassin be a CHILD for over 100 plus chapters was a good idea and then to charge that much money for it?? Really? It has so much potential but is ruined by him being a CHILD FOR 90% of the story! Why??? Who’s into this stuff?