The Human Kingdom of Talkia is at war against the Demon Federation Lorran. In an attempt to gain the upper hand, Talkia decided to use the hero summoning ritual, a magic ceremony that summons soldiers from another world bestowed with the blessing of the god Wion.

This time, seven heroes answered the call.

"Hello, I am Eun-Ha, Sung Eun-Ha, the incredible genius who got many engineering degrees and a PhD in physics at the young age of twenty-one. Ah? You are wondering why I am surrounded by a creepy group wearing some robes while I am dressed in some over exposing magical girl outfit? Haha, well... I was kidnapped by my friend to a comic convention and then she was surrounded by some ominous light so I just pushed her away and voilà! I am now an amazing hero who is going to kill monsters. Yay!"

"Does that kidnapper that calls himself the king really believes that I would obey him?! Let's just put the sweetest smile that I can muster to fool him and then let's escape from this place. I don't care if he says that he knows the way to return to Earth, I am not stupid enought to believe some kidnapper, I am going to find my own way home, I don't care if my cheat is weak compared to the other heroes, as a genius there is no problem that I can't solve!"

This story follows the adventures and desventures of Sung Eun-Ha, a genius that has a tendency to do idiotic things without thinking.