Saori Hayami
The opening theme for the first season is "Ring My Bell" by Blue Drops, consisting of singers Hitomi Yoshida and Ikaros (Saori Hayami), while multiple ending themes were used for each episode aired. For the second season, the opening theme for episode 1 is a cover of "Ring My Bell" sung by Soichiro Hoshi, while the opening theme from episode 2 onwards is by Blue Drops. As with the first season, each episode features a different ending song.