Lesbos no okite: Hatsukoi jigoku-hen - Oniyuri no Mitsutsubo

Original title: レスボスの掟 初恋地獄篇 鬼百合の蜜壺

Arimura and Tamaki were high school classmates. Back then, Tamaki had feelings for Arimura, but being at that delicate age, she kept her emotions hidden. For some reason, however, it became known around school that she was a lesbian, and she was bullied. Even during that time, Arimura was kind to her, but it was actually Arimura who created the opportunity for her lesbianism to be discovered. When they meet again for the first time in a long time, Tamaki finds out about this...