Nagaho Mori belonged to the now-disbanded national idol unit Fool's End. The group's unexpected dissolution was announced during the "Honnoji no Fes -a Burning Dream" event. This disbandment directly sparked the "Tenka Hata Sodatsu Battle Royale," a successor competition determined by music sales, live audience numbers, and merchandise sales. Nagaho Mori and fellow member Shinobu Sakuma stand as catalysts for this ensuing idol warfare era.