Just because Seiya failed the entrance exam for the university of his choice doesn't mean he's given up on life. In fact, he actually enjoys his little sister nagging him to study harder next time. It's an easygoing life, in a way. That's why one day when he wakes up in a stranger's bedroom in another world, there's no way he'd be able to sit easy. What's this junk about a wargame and thinking hard about tactics? Huh, winning something you've never seen before in your life?! Forget it!