This manga was filled with a lot of bullshit and ntr... And something that can easily fill a lawsuit. I do not recommend.
Do you think a teacher can easily force her students (that are children) into participate in adult trips and sex play and get away with it? (She said those who does not go will be expelled from school). And then literally made all the girls (and boys later) have sex on tje trip.
If I was one of those children's parent I would demand her head in court for forcing my child in such activities and possible ruin her future.
One of the girls
even had a boyfriend and cheat on.
This whole thing just angered me.
Also I got sick as all the girls getting with glasses guy just because he had a big dick, and leaving behind the other boys who could had been possible love interest.
If it was me I would had walk away and school be damn because i am a responsible person and if the teacher blackmails me i would blackmail back making her loose her job and teaching license.
And before you say "this is just fantasy", there are people out there (specially in japan) who takes this seriously and crosses the line.
And of course all girls goes with the big dick... There some other guys that need loving too u know.