Kanjiru Houkago

Nanae, 16, finds out her boyfriend is actually the "king of the sex industry"!? Panicked by this shocking revelation, Nanae turns to Mimata, the school's top sex expert, to impart her techniques to captivate him! During her sensual training with Mimata, Nanae's mind and body are thrown into disarray, but...!?

(Source: Kodansha, translated)