Thread:IanRootBeerDubber/@comment-22439-20150123024341/@comment-3547644-20150401023003

It would seem as though the OVA was based on some kind of side or short story:

lknovel.lightnovel.cn/main/book/4769.html?charset=big5/

bbs.hako.re/novel/noucome/ngoai-truyen-2d-khong-tuong-quyen/