Ore no Tantou wa Kaibutsu

Hananosuke Yamase, a struggling manga editor with no hits to his name, was fed up with Megumi Kojika, the talented author he had been keeping an eye on. Her problem? She was too close! Every time they met to discuss storyboards, she'd press herself against him, trying to seduce him. Hananosuke was constantly flustered by her, but one day he ended up taking her home! He almost crossed the line there, but then he discovered her true identity...!? His assigned author is a beautiful ex-con who committed murder!?

(Source: Kadokawa, translated)