Otherworlder (DxD/Overlord/Unknow)

He, Seiya Totsuka, has been reincarnated in this world after his death as an overworked office worker, but although a bit unusual this world was not so different from his past one. The problem is that as a fan of manga and anime, he expected to go a bit differently than that. So he kind of feels like his life is boring, he always has this feeling of void whenever he thinks about it. But, ho well, at least he has a caring mother and a hobby... which essentially is drawing mangas. Or more like usurping those from his past world that don't exist here.
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Okay, something else to add, the mc doesn't know about DXD, but he does know about overlord, so let's see how this goes.