Blade Play

Blade Play (ぶれいど ぷれい) is a manga series by Aomaru Seta. It in serialized in Mobile Man.

Plot
Whilst searching for porn on the internet, twenty-year-old university student Sudou Kansuke gets sucked into an RPG world called Munberdia. He is the chosen hero who carries the sword of light! Only the sword of light is not what you would expect.