Mo-Retsu! Boin Sensei

Kawano harbors a secret fascination with adult videos, and his fantasies revolve around a particular adult star known as Miss Boin, whose name is derived from the sound her large breasts make when they bounce. Unbeknownst to Kawano, the school he is about to teach at has a head teacher who bears a striking resemblance to his idol. The coincidence is further heightened by the fact that the head teacher shares the same distinctive mole on her ample chest as Miss Boin. However, Kawano is uncertain if the coincidence is more than just that. As he navigates his new role as a teacher, he becomes determined to uncover the truth behind the mysterious head teacher's identity.