Momoka Hanakomachi (花小町ももか Hanakomachi Momoka) is a declared girlfriend of Ruu who often visits the Saionji Temple to play with him. She is the first person besides Kanata and Miyu to find out about Ruu and Wannya being an alien, as well as their abilites and keeping it a secret together with Miyu and Kanata. She is the cousin of Christine Hanakomachi.
Momoka is a small girl that has red eyes and has brown hair usually seen tied in a tail on sideways. She always ride her red tricycle when she roams around the town or goes to Saionji Temple to play with Ruu.
Momoka acts more mature on her age as she scolds people, mostly older than her for not throwing the trash properly. She is able to buy stuffs on her own and keep the others from treating her like a child and doing her favors. Though, she plays with Ruu childishly, she mostly sees herself as a mature woman.
Momoka first met Ruu when she accidentally catches him through her net. After spending the whole day with Ruu and being saved by him, she falls in love with him and declares to be his girlfriend which confused Kanata, Miyu and Wannya.
She serves as Ruu's comforter whenever he cries, telling him boys are not meant to cry, so as the girls.
When Miyu and Kanata's class are having a play in which Ruu is included, Momoka came out of nowhere to be part of it but Aya told her that there was no role for her.