Will You Love Me Until the End?

Nagisa, who works at a hotel, secretly has a crush on Misumi, the vice president of a well-known jewelry company. She's content just talking to him every now and then, but one day, when he comes out of his room, she witnesses his "private side"... Then, a certain incident leads Nagisa to make a bold proposal to Misumi...!?

(Source: Shogakukan, translated)