There is a tower that summons chosen people called Regulars with the promise of granting their deepest desires. Whether it be wealth, fame, authority, or something that surpasses them all—everything awaits those who reach the top. Twenty-Fifth Bam is a boy who had only known a dark cave, a dirty cloth, and an unreachable light his entire life. So when a girl named Rachel came to him through the light, his entire world changed. Becoming close friends with Rachel, he learned various things about the outside world from her. But when Rachel says she must leave him to climb the Tower, his world shatters around him. Vowing to follow after her no matter what it takes, he sets his sight on the tower, and a miracle occurs. Thus begins the journey of Bam, a young boy who was not chosen by the Tower but opened its gates by himself. They call his kind Irregulars—beings that have shaken the very foundation of the Tower each time they set foot inside it.

Deep in the forest, far from any human contact, there lives a child named Ryouma Takebayashi. He engages in the rather strange hobby of keeping various types of slimes as pets. Furthermore, despite his young age, he has a sturdy physique and good compatibility for magic. All of this is because, having endured much hardship in his previous life, three gods grace Ryouma with a second chance to pursue one goal: savor the wonders of life. After three years of comfortable solitude pass by, Ryouma meets people that will change his current life forever. When he encounters and helps some soldiers tend to their wounded comrade, the group convinces him to accompany them to visit the nearby town's ducal family. Ryouma agrees and soon embarks on a journey to explore the vast world beyond his home.

Dressed in a conspicuous outfit and armed with an eccentric spirit, Hina Satou goes around insisting that she is the Asgardian god Odin. When she crosses paths with a boy named Youta Narukami, she uses her precognition abilities to warn him about an impending catastrophe threatening the end of the world. But being a teenager preoccupied with his problems, Youta finds it hard to believe such a preposterous claim. Somehow forced to tag along with her antics, he witnesses the effectiveness of Hina's skills with his own eyes and realizes that she truly is capable of divination. Nevertheless, despite her persistence in being a god, Hina is still a child who desires to see and experience the wonders life has to offer. With the world ending in 30 days, Hina, Youta, and their friends venture forward to create lasting memories they will cherish forever.

Short episodes with super-deformed characters posted on the official Twitter account. Includes three extra collaboration episodes with halca, the peggies, and eheya.