在原 七海

Nanami is Satoru's little sister, however, they hold no blood relation.

She's a sweet girl who excels at every aspect of housework. In terms of personality, she's rather placid and subdued. She tends to be shy and reserved when first meeting someone, but once she warms up to a person, she can be rather friendly.

In the organization, Nanami acts as Satoru's partner, providing him back-up during missions. Despite the fact that she frequently bashes him for his rash decisions, she loves him dearly and does her best to look after him. Little known by others, she also has a bit of a chuunibyou side to her.