Ability user

This is before atsushi entered the picture so ..there has been a new case given to dazai and kunikida on a new ability user who's rumored to be the most powerful amougst them all .. a user who's ability is still unknown is said to be seen in the orphanages using some sort of mind control on children and also after that person visits someone mysteriously dies . as planned dazai and kunikida check it out but instead of the most powerful user they come across a girl ... who reminds dazai of his past friend ..... what will this lead to ? a romance ? a hate ? disappeared relations ? new villians ? time for you to check it out ...