Ribbontail is an idol-type hero whose only redeeming quality is her cuteness, and she dreams of one day being recognized for her heroic abilities. But her new buddy is Zex, the most advanced and most powerful autonomous robot in history. Despite Zex showing no signs of opening up, Ribbontail is excited that she can accomplish great things together with Zex, but she gets caught up in an unexpected incident...
(Source: Hero's, translated)
— Description from AniList community (anilist.co).
