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![](https://pic1.mangapicgallery.com/r/avatar/c2/u484331_50x50.jpg?2)
I know a DJ with a plot similar to what you described.
The part 1 of http://www.mangago.zone/read-manga/manager_ni_natte_mo_mondainai/, which is not uploaded here but attached in discussion
Manga where whole class is taking a condom to confess to the sensei because the whole class likes him