Yamazu ni Koishite, Koroshiya-san!

Sumika has always been unable to read the atmosphere, and people have always kept their distance from her. One day, she offers a handkerchief to someone fighting on the street, and to her surprise, that person transfers to her new school the next day...?! "I quit my job as an assassin for you. Please fall in love with me." The first confession in her life was a fearful signal that her life was being targeted by an assassin organization.

(Source: Hakusensha, translated)