Yayoi is the series' main heroine, who saved Tetsurou from being hit by a truck owned by Higashikazuno Miya in front of Gokou Academy. She is a member of the so-called full-bloomed love, super amazon warriors group known as Koi Koi 7. She made a promise in childhood to protect Tetsurou forever, but Tetsurou does not remember making such a promise with such a cute girl. She was called "Light" by a girl who shares her name.
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