The show commits so completely to its premise that it stops apologizing and just lets you watch a genuinely useless guy stumble into situations where intimacy literally makes his teammates stronger. That's not a cover story for fanservice, it's the actual plot mechanics, which means every scene has permission to exist exactly as shameless as it wants to be. The romance works because Kizuna's incompetence makes him the only person in the room not performing, and the girls notice. If you're here for the ecchi, the show respects that choice enough not to pretend it's anything else.

Seventeen-year-old Hida Kizuna transfers to Ataraxia, a strategic defense academy on an ocean Megafloat, where students use Heart Hybrid Gear to hold off invaders pouring in from another dimension. His own fighting ability falls short, but his older sister Reiri, the academy's principal and high commander, has other plans for him. There he meets Chidorigafuchi Aine, a girl who pilots the magical armour Zeros. His Heart Hybrid Gear, Eros, can power up a girl through indecent contact, so he is made captain of Amaterasu, the school's ace team. The role earns him a reputation as a pervert among his classmates. The result is a sci-fi action comedy with heavy fanservice and romance, mixing battles against otherworldly weapons with a steady stream of embarrassing situations.