While driving the Route 66 bus, she would take the people who got on (after getting charms from Jedite, disguised as a worker at the temple named Jed) through a black hole into another dimension where their energy would be drained. Serena and Luna got aboard the bus and entered the dimension where they fought Kigaan. Jedite sent Raye through the black hole when she discovered that he was behind the disappearances. Sailor Moon trapped Kigaan with her tiara, and Raye transformed into Sailor Mars for the first time. Sailor Mars destroyed Kigaan with Mars Fire Ignite.
Kigaan is never seen using any attacks but she does have sharp claws.
- Kigaan is the first Negamonster, and therefore the first monster of the week, to be destroyed by a character other than Sailor Moon. Name Source: "Kigan" means "prayer" in Japanese and the youma collects energy from students who have just purchased charms for prayers.