Thanks for explanation about cards any why "girls" can't become demon kings. it will be interesting how Author will implement those cards(effects, how does they work etc.) and how big will be they part in battle/war of Demon Kings.
Also is being(or perhaps becoming would be better word for it) a "card" predestinated thing(i.e. either you're card or you're not) or more flexible system?
Obviously, many questions will be answered after volume will be released or perhaps in latter volumes.(assuming that this LN will succeed)
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