Twenty year old Naofumi Iwatani is a college student with an allowance that lets him stay at home enjoying an Otaku life. One day a book drops to the ground while at the library which tells of four Cardinal Heroes being summoned to the other world of Melromarc; each wielding a di...

A retainer-like device known as the "SCM" is being sold on the internet and rumours have it if you wear it and challenge another person that's also wearing to a duel, you can turn them into your slave when you win. Ohta Yuuga comes across Eia Arakawa one day after dumping her bes...