Hayase Manami

Metis: <Penetrator> (Fortification on pencil)

Hayase Keiji's younger sister. She harbors romantic feeling toward Keiji. After Keiji got transfered to Suminoe Gakuen, she works hard to wake up her own Metis so she can get to the same school as him, which ends up successful. Even though she is brutally honest to people, she can't help but be dishonest towards Keiji, making her feeling obvious to everyone, including her parents

Spoiler

and Keiji himself

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An outgoing girl. She sees every girls close to Keiji as her rival, although she can't bring herself to hate them and will actually help the girls win his heart.

Spoiler

It is revealed that her metis <penatrator> is manifestation of her wish to penetrate any possible obstacle that hinder her to be by Keiji's side. It is able to do both hardening on object and nulification technique that can break physical and Metis laws.