A new school year has begun at Ayanagi Academy for Yuuta Hoshitani and the members of Team Ootori. As the school's annual graduation performance titled Shadow and Lights quickly approaches, the second-years in the Musical Department must participate in the production as part of their curriculum. Out of the 25 students in the division, five of them will receive a training role and actively participate as actors in the program alongside the graduating class. Attaining one of these coveted spots will not only increase a student's academic standing within the department, but it will also put them in the running for a position on the elite Kao Council. While every student in the department strives to obtain one of the five training roles, Team Yuzuriha's Riku Ageha is practically a front-runner for the role of Alexis' Shadow. Having idolized an Ayanagi alumnus' performance of Alexis, Ageha has spent a majority of his life perfecting the portrayal in hopes of being selected for the show. In contrast, Hoshitani's lack of experience in show business puts him at a great disadvantage for any of the roles in the production. With specialized training from the Ancients—former Kao Council members and Ayanagi alumni—the second-years give it their all as they aim for the stars and beyond.

Following a successful graduation performance, Yuuta Hoshitani and the rest of the second years begin preparations for the upcoming Ayanagi Festival. This year's festival is the first time the students will be without their Kao Council mentors, giving them the creative freedom to do what they want. Hoping to perform alongside each other for once, the second years decide to put on a joint production together. The festival’s opening ceremony will also serve another purpose—to reveal next year's Kao Council candidates. The Kao Council announces that Team Hiiragi was selected for the opening ceremony performance, preventing them from participating in the collaboration. This shocks and enrages Hoshitani and the others, driving a rift between them and the Kao Council. In an effort to realize their dreams, the students begin to hatch a plan to ensure that all of the second years can perform together on stage.

A long time ago, the ancient saviors of humanity founded a village as their haven, with their descendants said to assist humanity in times of extreme chaos. This village, Kunlun, is located just beside the infamous Last Dungeon—a place where monsters of unimaginable strength reside and which serves as the hunting grounds for Kunlun residents. Despite being accustomed to defeating powerful enemies since childhood, Lloyd Belladonna regards himself as the weakest in his village in terms of magic, strength, and intelligence. Even so, to fulfill his desire of becoming a soldier, he goes to the Kingdom of Azami to enroll in its military academy. However, as someone whose upbringing defies common sense, Lloyd's innate power might just prove to be the key to end the crises enveloping the kingdom!

Fifteen years ago, disaster struck human civilization, and now dangerous man-eating monsters roam the ravaged lands, posing an existential threat to the remaining survivors. Amid this turmoil, an isolated facility shelters children and nurtures them in peace. However, as a few among them find out about the world beyond the narrow periphery of their nursery's walls, their curiosity about it slowly grows. Meanwhile, in the outside world, young survivors Maru and Kiruko band together to search for a special place called Heaven, each for their own reasons. Carrying past burdens and tragic secrets, the two hope to find answers to the cruelty they have experienced in their lives and in the world, which still remains in tatters.