In a flooded world, a boy rescues a robotic girl from the sea. Grateful, she vows to be his "leg" until fulfilling her former master's order, leading to an unforgettable summer adventure.

Hero Academy's top student Arnest Flaming meets Blade, a transfer student who is roughly her equal. The king asks her to supervise and show him around. The quest to become true heroes begins!

Komi é linda, mas é tímida e antissocial. Na escola, ela conta com a ajuda de Tadano para resolver esse problema e estabelece uma meta ambiciosa: fazer 100 amigos.