After the great war ended with humanity's victory, the world suddenly gets "overwritten" right before the eyes of a boy named Kai.

Reborn with the perfect bloodline, this sorcerer is determined to enjoy his new life using his extraordinary magical abilities to master the study of magic that was beyond his reach in his previous life!.

The story takes place between the first and second seasons, where Rimuru confronts the swirling conspiracies in the Coleus kingdom.

A compassionate girl enrolls herself in the Asticassia School of Technology in Planet Mercury that is run by the Beneritt Group that creates robotic mobile suits.

Spring time in April and the last of the cherry blossoms are still in bloom. The usually aloof bookworm with no interest in others comes across a book in a hospital waiting room. Handwritten on the cover are the words: "Living with Dying." He soon discovers that it is a diary kept by his very popular and genuinely cheerful classmate, Sakura Yamauchi, who reveals to him that she is secretly suffering from a pancreatic illness and only has a limited time left. It is at this moment that she gains just one more person to share her secret. Trying to maintain a normal life as much as possible, Sakura is determined to live her life to the fullest until the very last day. As her free spirit and unpredictable actions throw him for a loop, his heart begins to gradually change.