Kenakalan diam-diam di bawah kotatsu - ibu tiri yang era sekarang lagi sange berat dan memutuskan untuk mengurus semua urusan ini ke tangannya sendiri

Her step-father has remarried and her step-mother is a woman not much older than herself. A step-mother is lusted after and an erection is given! The other party also feels the same way and secretly makes out in the kotatsu. Eventually, the two of them can't help themselves and find themselves in a situation where their step-father is nearby... 12 episodes included!