Nami Kotobuki and her twin sister Mina serve as the youngest members of the Better Fortune Research Organization, both elementary school students. They embody two Shichifukujin deities: Mina manifests Fukurokuju while Nami channels Juroujin. Their bond as fortune-linked deities makes them nearly identical, functioning as a binary pair. Ordinarily, both exhibit extreme lethargy, collapsing and sleeping after minimal exertion. This dormant state sharply reverses during transformation, when they surge with energy and engage in combat against Magatsugami—monsters that consume human misfortune and negativity. Their combined power enables coordinated, potent attacks with fellow Happy Seven members. Episode 6 specifically highlights their symbiotic relationship and shared traits.