The story centers around Hida Kizuna, who visits the strategic defense academy Ataraxia at his big sister's request. There, he encounters Aine Chidorigafuchi, a girl piloting the magical armor Zerosu. Aine suddenly pulls off her clothes before Kizuna's eyes. "Don't look, you pervert-" "No, you're the one?!" However, a communique about a serious mission arrives from Kizuna's sister. The mission-to rub Aina's chest?! Actually, Kizuna has the power to level up a girl through indecent acts. With a battle against another world, the future depends on this power.
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