Adolf K. Weismann is sharing a peaceful meal with his loved ones, but as the days go by, some begin to realize that this perfect world where everyone is alive and happy seems too good to be true.

(Source: TubiTV, edited)

Misaki Yata is a youth whose reckless and immature attitude has led him to be shunned by his classmates. Saruhiko Fushimi is a loner who views the world in a pessimistic way. Despite being polar opposites, the two become the best of friends.

(Source: TubiTV)

After an embarrassing high school class reunion with their successful classmates, who have "proper" jobs, relationships, and even children, the Matsuno sextuplets return home to sulk about their status as NEETs. They spend the night drinking away their sorrows, eventually falling unconscious, until they awaken in a strange world of memories, centered around one of the brothers' biggest high school regret.

As the sextuplets navigate this memory world, they encounter their embarrassing past selves from high school, as well as those of their friends. All the while, they try to uncover whose regret was great enough to trap them in this strange world, so that they can make their way back to reality. However, they're running out of time; this world of memories is unstable, and the sextuplets may lose their chance to make things right if they're too slow....

Lately, the stress of having to constantly keep his destructive power under control is causing the Red King Mikoto Suoh to become unstable. Meanwhile, Reisi Munakata is chosen by the Dresden Slate to become the new Blue King.

(Source: TubiTV)