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Dragons Rioting is pretty good but it's not finished. Dude has a disease that will kill him if he gets aroused so his dad trains him in martial arts to protect him from death and when he finally goes back to society he accidentally transfers into an all girl school that recently went coed and all the girls are fighters.
It's pretty ecchi but it's not too bad since the whole point is to avoid arousal it's usually ecchi and then him kicking ass in some way trying to avoid the dangerous situations.