What will nursing be like in the future? Yukie Sakai, a home care giver, is a specialist for nursing patients under the serious condition. The patients are, for example, "Reddleman," the hero who used to protect peace on earth, and the president of an advanced nursing home in which everything is controlled by machines, and...! (Source: BookLOUD) Included one-shots: Volume 1: Tantei SumoKING (Detective SumoKING), India de Ransuu Volume 2: Separate

Dementia 21 was published in English by Fantagraphics in two volumes from September 25, 2018, to February 18, 2020. It was also released in Brazilian Portuguese by Editora Todavia from March 5, 2020, to September 11, 2023.