Ido serves as one of two extraterrestrial maids designated Planet Warriors, protecting Earth from monster invasions. She lives with a 12-year-old schoolgirl, handling domestic tasks while combating city-threatening monsters. Ido shares an open romantic relationship with fellow maid Mei Toujou, residing and sleeping nude together in the same quarters. Their bond directly enables combat effectiveness, as they kiss to become magical nurses for healing—demonstrated by reviving a seal-like creature through water administration post-transformation.