Yuzaki Nasa's first name has the kanji for "Brilliant Night," yet it's articulated as "Nasa". He attempts to be appropriate for his unusual name by continually focusing on the top. Yet, one frigid night, he allows his gatekeeper to guard and gets hit by a vehicle while pursuing an adorable young lady. The young lady, Tsukasa Tsukuyomi, spares him, and Nasa takes that second to admit to this puzzling and charming outsider! Tsukasa consents to go out with him...but just on the off chance that they get hitched! Quick forward a couple of years and Nasa makes his way for see Tsukasa, who calls him her significant other! Hence starts their unusual wedded life.