Ep. 1: Riri Hitotsuyanagi faces unexpected rivalry among Lilies at Yurigaoka Girls' Academy while defending against Huge threats.

Riri Hitotsuyanagi enrolls at Yurigaoka Girls' Academy with the goal of becoming a Lily and protecting humanity from the Huge. However, she quickly discovers that her fellow Lilies are far more competitive and aggressive than she anticipated. The situation escalates when a Huge specimen manages to escape its containment. Without any prior combat training, Riri must rely on her instincts to survive her first encounter with the monster. This episode explores her initial struggles within the academy's intense environment and her sudden thrust into life-or-death combat against the Huge.

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