SCHOOL-LIVE!

Yuki, Kurumi, Rii-san, and Mi-kun are members of the School Life Club, which aims to experience aspects of school life beyond regular classroom activities. To achieve their goal, they spend their nights sleeping at the school.

The School Living club prepares for a summer of activities as Yuki completes her final tutoring session with Megu. Eager to embrace summer traditions, she plans a night-time challenge at the school to test the group's courage, unaware of what surprises—or fears—might await them in the dark.

A blackout disrupts the girls' daily routine, but Yuki's suggestion to camp in the classroom turns the inconvenience into a fun experience. As they set up tents and talk late into the night, Megu reflects on the day that first changed their lives and their understanding of what a normal day means.

Yuki becomes excited about organizing a field trip to the mall, believing it can be justified as a school-sponsored activity. Despite Rii-san and Kurumi's concerns about the club's rule against leaving the school grounds, the group considers the outing as a way to revisit events from before they met Mii-kun.

Yuki and the group embark on a field trip to a remote mall, where they search for supplies in a basement supermarket. Kurumi discovers a puppy, later revealed to be the future mascot of the School Living Club, who accompanies them as they head to the fifth floor to join Mii-kun.

The School Living club welcomes new members Mii-kun and Taromaru after they return from a tense encounter at a shopping mall. Yuki and Megu-nee give them a tour of the school, and Yuki organizes a field day event to celebrate their inclusion in the club.

During an after-school study session, Yuki struggles with classical literature until Mii-kun arrives to tutor her senpai. Moved by a passage from "An Account of My Hut," Yuki shares her belief that old books are messages from the past, prompting her and the School Living Club to write their own letter to the world.

Taromaru ends up covered in green algae after swimming in a rooftop "lake," prompting Yuki to bathe him while the rest of the club handles her soiled laundry. As they dry the clothes outdoors, the group discusses graduation and their future plans. Later, Mii-kun and Rii-san stay up late searching for the lock that matches Megu-nee's secret key.

Yuki's sudden outburst with a deck brush in the club room leads to an impulsive plan to transform the rooftop water tank into a temporary pool. The girls work together to clean it, relocate the fish, and spend the day enjoying their makeshift swimming hole.

While it rains heavily, the School Living club members grow concerned when Taromaru fails to appear for their meal. Yuki and Mii-kun search the club room, while Kurumi explores other floors, leading to a discovery beyond a barricade on the first floor.

A power outage plunges the school into chaos as an unknown group invades, overwhelming the School Living club room. Kurumi lies unconscious after being attacked, leaving Rii-san to fulfill her promise alone, while Mii-kun struggles to find the strength to search for a vaccine after losing Taromaru. Just as she is about to be grabbed, Yuki unexpectedly appears to save her.

The School Life Club faces a dire threat when large numbers of THEM invade the school, putting the club and its members in serious danger.