As the graduation ceremony at Katagiri High School comes to an end, Kyouko Hori, her boyfriend Izumi Miyamura, and their friends begin to look back on their time as students. The moments they shared together may be fleeting, but each one is a colorful piece of their precious memories.

Thousands of years ago, the ancient dragon Bahamut wrought havoc upon the land of Mistarcia, a world where both gods and demons live amongst mankind. Working together to prevent the world's destruction, the rival deities barely managed to seal Bahamut, agreeing to split the key between them so that the dragon would remain eternally imprisoned. With the world safe from the destruction of Bahamut, it is business as usual for bounty hunters like Favaro Leone. Living a laid-back, self-serving lifestyle, the amoral Favaro goes about his work while on the run from fellow bounty hunter Kaisar Lidfard, a righteous man who swears vengeance upon Favaro. However, Favaro's carefree life is thrown into chaos when he meets Amira, a mysterious woman who holds half of the key to the world's fragile peace. Shingeki no Bahamut: Genesis tells the story of a group of unlikely heroes who find themselves caught in the middle of an epic clash between gods and demons, forced to carve their own path in the face of the imminent storm.

While testing out his camera on a bridge one summer night, Kaito Kirishima sees a blue light streaking across the sky, only to be blown off the railing seconds later. Just before succumbing to unconsciousness, a hand reaches down to grab ahold of his own. Dazed and confused, Kaito wakes up the next morning wondering how he ended up back in his own room with no apparent injuries or any recollection of the night before. As he proceeds with his normal school life, Kaito and his friends discuss what to do with his camera, finally deciding to make a film with it over their upcoming summer break. Noticing that Kaito has an interest in the new upperclassmen Ichika Takatsuki, his friend Tetsurou Ishigaki decides to invite her, as well as her friend Remon Yamano, to join them in their movie project. In what becomes one of the most entertaining and exciting summers of their lives, Kaito and his friends find that their time spent together is not just about creating a film, but something much more meaningful that will force them to confront their true feelings and each other.

Upon witnessing a man's head cracked open with an axe, 16-year-old Yuri Honjou trembles in fear and confusion as she flees from the masked assailant, only to find out she's trapped in an abandoned building where every door is mysteriously locked. Desperately searching for a way out, Yuri runs to the rooftop, but a world with no signs of life stands before her, surrounded by high-rise buildings. Though filled with despair, once she learns that her brother is also in this strange place, Yuri is determined to find him and escape. However, she soon finds that there are more masked murderers in the area, anxious to terrorize their newfound victims and satiate their sickest desires, leaving Yuri to question if they will be able to make it out alive.