Akari Kageyama

The stage is set during the 19th century London, in its capital where a wall divides the east and west of the Kingdom of Albion. Five high school girls, who enrolled in the prestigious Queens May Fair School, are involved in spy activities that involve disguise, infiltration, car chase, and more. These girls take advantage of their special abilities and fly around the shadow world.

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.

The story centers around Hida Kizuna, who visits the strategic defense academy Ataraxia at his big sister's request. "There, he encounters Chidorigafuchi Aine, 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.

The sibling gag comedy manga centers around Umaru, Taihei's little sister who boasts beautiful looks as well as prowess in both school and sports; however, "Himouto" (beautiful little sister) has a certain secret.