Nezumi no Hatsukoi  

ねずみの初恋

"Nezumi was brought up as an assassin by the yakuza and has never experienced love from humans. Meanwhile, Ao is an average person with no knowledge of anything. Despite their differences, they fall in love and decide to live together. However, their happiness is short-lived as they are constantly surrounded by evil." This story depicts the tragic love story of two individuals who are torn apart by the cruelty of their circumstances.