Ichirou Kuga

Ichirou is a Shoujo Mangaka and also the Owner of a Social Apartment. He's a Wise person who provides for his two younger siblings, Machi and Fumio by himself.

Ichirou supports his siblings from his job as a shoujo mangaka. At the verge of a certain deadline, a very capable assistant known as Shiori Goshiki turns up at his house. They clear up the deadline with no incident, but all of a sudden she declares that she is the Princess of a Kingdom and that now they're bound together by a vow of marriage.