Mayoiga — Season 1

All the characters are on a bus trip to Nanakimura. Whilst they introduce themselves the bus driver starts to argue with one of the characters, Valkana. The bus driver attempts suicide by trying to crash the bus. They manage to stop the bus driver and take a break. During their break at some town they meet up with Koharun, the woman that knows the way to Nanakimura. They are starting to get close to their destination. There's only one bridge left they have to cross.

Finally in Nanaki Village, the group steels themselves to meet the current residents, only to find the village seemingly abandoned. As they begin to explore the village, many begin to question the group's organizers.

The question of Yottsun and Masaki's disappearance circulates within the group, as they speculate how and why they disappeared. Tension arises as they try to uncover anything that may help them solve the mystery of their disappearance.

The tour is now divided into two camps: those who wish to stay and those who wish to leave. As the former decide their course of action to secure their safety, the latter heads back down the mountain. Will they manage to leave?

Their escape plans thwarted, Mikage's group returns to the village to report their findings, only to find that Jack has broken free. As accusations fly, their unease only grows.

While the two groups reunite in the village, the mounting suspicion of each other strains the group dynamic. As the group struggles to find some semblance of cohesion, more members begin seeing apparitions.

Mitsumune and Masaki have a heart-to-heart where Mitsumune reveals his past and what led him to Nanaki Village. Masaki tells him he can leave the village if he can confront his past.

Captured by the group, Masaki reluctantly begins telling her story and what her connection is to the village, but not everyone trusts her words.

As members of the group left behind try to make sense of their situation, Masaki, Hayato, Mitsumune, and the bus driver continue toward the tunnel. Masaki finally explains why she is adamantly against going through the tunnel, but how much of what she says can be trusted?

Mitsumune regains consciousness in the outside world, but he can't shake off the feeling that he must go back to get the others. Meanwhile, the group left behind in Nanaki Village experience a curious, growing lethargy.

Valkana's crew attempts to revive the other tour members who're experiencing a strange lassitude, but their efforts are interrupted by Jack and Judgeness, who reveal the true mastermind behind the whole tour.

With Hayato's Nanaki on the loose, the group runs for their lives. Haruka is watching her plan unfold when she receives word from the last person she expects to hear from.