Princess Lucia (プリンセスルシア Purinsesu Rushia) is a Japanese manga series written and illustrated by Kouji Seo. It first premiered as a one-shot in Mag Garden's Monthly Comic Blade magazine in the September 2008 issue, before launching it as a bi-monthly serialized title in the magazine's March 2009 issue. While in co-production with Seo's work with A Town Where You Live by Kodansha, the series went on hiatus before resuming on May 30th, 2014. When the Comic Blade magazine went defunct on July 30th, 2014, the series was moved to Mag Garden's new Monthly Comic Garden magazine starting on September 1st, 2014, while also continuing publication on Comic Blade's website. The series first volume was digitally released in North America by Digital Manga.
Yuta Koizumi is a normal human student who happened to be born of June 6th, 1994 at 6:06:06 during the sixth year of the Heisei era. But one day, Princess Lucia of the demon realm descends in his room and says she must give birth to a child with immeasurable power and the conception can only be performed if the mating human's birth is a fun line-up of six sixs. Because Yuta fits the bill, his normal life becomes turbulent over hell and heaven as two angels, Rie Kasukabe and Eru Mikamoto, are assigned to prevent Lucia from achieving her goal.