VANDR-105 Virgin girls who have just started menstruating are developed into erotic vaginas by a lolicon teacher in the library while suppressing their voices.

Students who have just started menstruating become the target... A lolicon teacher conducts sex training in the name of sex education on underdeveloped students in the school library… Teaching them to orgasm from a massive dick after losing their virginity, he relentlessly torments the girls even when other students are present. The girls stifle their voices and say 'Teacher... it hurts...' in a voice that no one can hear, but they end up being subjected to internal ejaculation...