Story about two twins: one lives alone locked away in a tower and the other is a crown prince. What if they could trade places...? Originally published as a full-color one-shot Adolte to Adarte (アードルテとアーダルテ) in 2011 on pocopoco web magazine. Serialization of the series started in the May 2017 issue of the Ultra Jump magazine.
Doesn't look like anyone has reacted to this yet