Demi, after getting stuck in another timeline with a broken clock [what he uses to keep time stable], assumed the identity of Ace, unaware that they'd eventually meet due to his lack of foresight. The two united and realized they were, in fact, the same person stuck in a new messed-up timeline. Their fullname was Academia, however after discovering one another, assumed the nicknames Demi and Ace so they could actually refer to the other without it being weird. Demi found it strange that him and Ace had quite distinct personalities despite being versions of the same person in different lives.

His life before meeting Ace was more carefree and this lack of responsibility eventually led to Demi's "fuck-up" as Ace likes to put it. He knew of a man in his own timeline called Gaunter Thierry, as they were housemates and good friends. The two would have deep conversations, explore in the night [as Gaunter hated being in the open unless it was dark for a reason Demi didn't know], and they'd even help Gaunter with accounting and managing money. Believe it or not, the carefree timekeeper was a part-time accountant for a friend when he wasn't focusing on the flow of time. Gaunter, of course, knew about his powers and responsibility. The two had a close bond but lost contact after the incident.

After the events of the "fuck-up", Demi and Ace decided to work together to manage all of time, namely their own timelines, and swore they'd never interfere in their previous lives or mess with the timeline ever again. Because of this, connections such as Gaunter were lost, and new ones were made, such as Mobius, another powerful being who could jump between timelines without consequence.