Ayumi Inoue

Ayumi Inoue is the protagonist's childhood friend, she's a few years older than him and she still lives next door. He had a crush on her when they were kids, but she eventually got married and the two haven't seen each other often since then. She was one of the Pure Maidens who fought the evil invaders from the Negaverse: the gentle light of affection, Pure Sapphire.