Ryoka Narusawa (成沢 稜歌,Ryoka Narusawa?) is one of the main characters of the series and an energetic spirit guide with enormous breasts who is Yuta's best friend. Calls herself "Ryo-tas", and Yuta "Gamotan". She wields an electric stun-gun shaped like an old-fashioned raygun modelled after the Wardeclyffe tower which is then nicknamed the "Poya-gun" according to Yuta.
Ryoka has light brown eyes, short brown hair. She has a rather shapely figure accented by her large breasts and wide hips, she is seen wearing a white long coat and embroidered blue roses from her coat collar. She also wears white gloves, and her leg-wear consists of a pair of white thigh high socks and white shoes.
Ryoka Narusawa is a very lively, bubbly girl. She is seen as comic relief, but the episodes have been hinting that she is actually a part of something bigger. Her seemingly carefree personality adds humor to the plot and story, considering how truly dark everything is.