The series unfolds from the perspective of the two members of the secret group, those being Maribel Hearn and Renko Usami, the only members of the Secret Sealing Club. And describes the various stories that happened in Gensokyo in the past.

Hifuu Club Activity Record ~ The Sealed Esoteric History Season 1 Episode 5 airs Thursday, December 31, 2026. Track your progress and get a reminder before air time — free, no ads.