Kiruru Kill Me Vol 4

Kiruru Kill Me by Akihiro Dobashi. An Action manga rated Teen, published in English by Seven Seas.

Aoi Nemo is a brilliant young medical prodigy who seems suave in public but secretly longs for love. When he falls head over heels for Kiruru Akaumi, a deadly assassin, he comes up with an unusual way to spend time with her: hire her to kill him, and trust his medical genius to keep him alive. An action rom-com with a sharp, deadly edge.