Usotsukikon to Hoshizukiyo

A sudden contract marriage with the older, science-minded man she's always admired! Uzuki, who works at a flower shop, has a crush on her customer, Orikasa. It was supposed to be just a sweet, unrequited love, but after witnessing a certain scene involving Orikasa, Uzuki mustered all her courage and proposed a contract marriage…! And so, their gentle, albeit somewhat deceptive, new life as a married couple begins in an old observatory. This love is like a faintly twinkling, wandering star… (Source: Shogakukan, machine translated)