Koroshiya S no Yuragi

The cold-blooded assassin, codename "S", always gets his prey. But when he set his sights on the 17-year-old Kirito Furukawa, the only daughter of a Yakuza boss, he felt emotions stir in his heart that he had never felt before. Now he has gone from her killer to becoming her bodyguard.
Nominated for the Tsugimanga 2020 Award in the Manga Category.