Neben der Suche nach den Geheimnissen der Clubs stösst Eruna auch auf ihr eigenes Geheimnis. Und ihren ersten Gegner.
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.
星鎖に誘われ、帰宅部へ仮入部を果たしたエルナは、帰宅部の代表である星鎖の代わりに対抗戦に出場することになる。初めての対抗戦に加えて、必殺技も何も使うことのできないエルナは、ランキング上位の部活を見学して回ることに。書道部、美術部、演劇部、天文部と様々な部活を見て回るエルナだったが、必殺技の糸口さえも掴めぬまま対抗戦を迎える。
자신이 동경했던 귀가부 선배, 세이사의 권유로 귀가부에 임시 입부하게 된 에루나. 거기에 더해 동아리 대항전에 귀가부 대표로 나가게 되는데…
