what is this a dj of?

I think it's oc and just one shot ( well there's a second part)

Judging by the story I'd say it's super influenced by haikyuu and kuroko no basket ლ(´ڡ`ლ)

ah that makes sense... like how ogeretsu tanaka created a dj of their own work? ok

Well yeah,, doujin is usually fan-made story.. but the word doujin literally meant self-published stories..

this one for instance, because it doesn't involve any publishing company.. If you don't know I guess,, I didn't know too before (=・ω・=)