from If She's Silent, She's Just a Beauty
Doudou-san is Murasaki's coworker. When she sees Aoyama for the first time she finds her extremely cute and gives her the nickname "Lightning-san." She becomes her friend after Murasaki introduce them to eachother.

If She's Silent, She's Just a Beauty
Aoyama Mio is Murasaki's kouhai in the tennis club. And though she doesn't talk much and gives off a cool beauty vibe, once she really gets talking her true colors start to show...