Isshiki-san wa Koi wo Shiritai.

A maiden who doesn't know love tries her hand at dating as a pseudo-couple!
Inspector Rinna, a hard-working and serious policeman who is respected by everyone in her department, seems to be having trouble with her work lately. The reason for this is because she's been losing focus. It only happens when Meisi, the detective she works with, is around... So, she makes a choice...?
(Source: Kadokawa, translated)