 If you liked
Moujuu School Days
|
 ...then you might like
Shiri Fechi nanka ni Sukarete Tamaru ka
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Both manga begin with the uke's ass being groped on the metro by some perverts, and our seme bearing witness to the incident. Various school mates also sexually assault the uke.
Bonus: Both manga resort to victim blaming and shaming, instead of providing him emotional support and explaining to him that sexual assault is *never* the victim's fault.