Usotsuki-Kon to Hoshizukiyo

"I'm going to go to that observatory to get married.“

Suddenly, she is contractually married to the man of her dreams, whom she has secretly had a crush on, for a reason!
Uzuki, a lifelong solitary who works as a live-in florist, has a crush on a customer, Mr. Orikasa.
An astronomer, he is intelligent, kind, and accepts Uzuki, who is younger than him.　
It was supposed to be a fleeting one-sided love, but when Uzuki encounters Orikasa in a certain situation, she summons all her courage and proposes a contractual marriage..!

A "liar" marriage begins in an old astronomical observatory, just the two of them. Uzuki becomes a new wife, but she still keeps her love for Mr. Orikasa a secret... This love is a faint, shimmering, and deceiving star.