Tamon Kitayama serves as a member of the covert magical girl unit Happy Seven under the guise of the Better Fortune Research Organization, embodying the deity Bishamonten. Her combat prowess manifests through the ability "Jarei-mekkyaku raiko sange," channeled via a spear, armored attire, and a flowing cape during transformation. Shy and reserved in civilian life, she adopts a fiercely confident demeanor when confronting Magatsugami—entities born from human misfortune.

Her younger sister, Kuan Kitayama, provides tactical expertise through advanced technology and gadgetry, bolstering the team’s operations. Among Tamon’s allies are the Kotobuki twins, Mina and Nami, who personify Fukurokuju and Juroujin; their collaborative dynamic surfaces in episode 6, though Tamon’s specific role in their subplot remains undefined.

Tamon’s narrative centers on her dual identity, adherence to the Happy Seven’s protocols—particularly those dictating conduct toward male teammate Kikunosuke—and her unyielding commitment to eradicating threats to humanity’s fortune.