HND-622 Stealthily approach, destroy the mind, forcibly impregnate, gang rape new female teacher, Yumiya Shuri

I've been a teacher, my dream job, for half a year now and somehow managing to do well. I also got engaged, but I don't plan on quitting until I see off the graduation of the students I'm currently teaching. The steadfast new teacher, Akari, suddenly gets thrown into hell! A student who had feelings for her goes berserk upon learning she has a fiance and rapes her! She didn't think she'd make an enemy out of anyone, so she doesn't know who's raping her! The rapist blackmails her with photos as evidence of internal ejaculation, drives her to the edge mentally, and carries out a terrifying gang rape!