Mikagura School Suite

As Eruna Ichinomiya, a somewhat perverted schoolgirl, is pressured into choosing a high school, her cousin, Shigure Ninomiya, recommends his school, Mikagura Private Academy. Taking an interest in the principal's granddaughter, Seisa Mikagura, Eruna decides to take the entrance exam, which she passes by being able to see the school's feline teacher, who she names Bimii. At the start of her new school life, Eruna learns about the school's system, in which students are required to join one of the school's clubs, using points earned by battles against other clubs to improve their state of living. Stuck with the poorest living conditions due to not yet being in a club, Eruna attempts to join Himi Yasaka's Calligraphy Club, but is rejected due to her poor art skills. A few days later, however, Eruna is approached by Seisa herself, who invites her to join her Going-Home Club on a trial period on the condition that she act as the club's representative in a battle taking place the next week.

After learning about how students can use special abilities during club battles, in which student's must destroy all three of their opponent's crystals, Eruna pays a visit to each of the different clubs, learning about the various abilities the representatives have. However, Eruna struggles to come up with her own special ability by the time of her match, in which she must battle against Himi. As Eruna quickly finds herself on the defensive and goes into hiding, she comes across a sealed room and briefly sees a mysterious woman, who tells her that she has already possesses a power inside her. When she regains her senses, Eruna discovers she now possesses super speed and a finger laser ability called "Toy Gun", which she uses to destroy all of Himi's crystals in one go and win the match.

After learning about an upcoming rookie tournament for new students, Eruna reports her victory to Seisa, who claims that she only won because Himi held back and challenges her to a practise match with her club membership on the line. Prior to her match against Seisa, Eruna observes a practise match between the Astronomy Club's Asuhi Imizu and the Drama Club's Yūto Akama, with Yūto winning with a single strike. The match between Eruna and Seisa soon begins, with Eruna attempting to destroy Seisa's crystals whilst she is dozing off. However, Eruna's Toy Gun fails to activate and she is overwhelmed by Seisa's "Killing Art" ability, getting kicked out of the Going-Home Club as a result. Bimii, after informing Eruna that she needs to build more experience to use her ability properly, suggests that she form a club of her own, using the rookie tournament to attract potential members. Admiring her determination, Seisa lets Eruna bring her sleeping bag into her mansion.