It's what the title says, it's about the demon Misaki Ayuzawa-future Usui and his perverted outer space alien stalker Takumi Usui's married life! Being married have lots of ups and downs: fun moments, kisses, arguments, misunderstandings, jealousy, and etc. How will these two go through it? Can Usui Takumi stop Tora Igarashi from having feelings for Misaki?