This is a world of conflict and collapse!
Who is the protagonist? Kuchiki Shiromori, the captain of the 6th team, is a brother-in-law. He is dissatisfied with his little sister being abducted by a certain strawberry king, so he disappears into the world every month in a certain year. Unexpectedly, he has multiple identities. His mother is Kuchiki, the largest nobleman in Japan, his father is actually an Italian tycoon who wants to die, and his half-brother is actually Bailan, the leader of Mirufio. After that, he was accidentally framed by Aizen, and accidentally traveled through time... As a result, the protagonist became powerful, so powerful that he could use the energy of Yagami as Kira to jump, make L look at him with new eyes, give him a thumbs up, make Captain Yamamoto blow his beard and glare, and...
To sum up, in one sentence, this is a collapsed world!