After the gods' protection wanes, a new era emerges, granting humanity a chance for renewal. The Hero Club members of Sanshu Middle School, having completed their obligations to Taisha, now embrace a carefree youth as ordinary students. Yet, this tranquility comes with a price. In the year 298 of the Divine Era, Mebuki Kusunoki competes for the coveted hero position, only to lose to Karin Miyoshi, sparking Mebuki's resentment towards Taisha. Fast forward two years, Mebuki assumes the leadership of the Sentinels, a team assigned to venture beyond the protective barrier. Their straightforward mission swiftly morphs into a perilous journey as unexpected dangers threaten the team and civilians alike. Determined to validate her heroism, Mebuki swears to safeguard every life at all costs, proving her mettle in the face of adversity.