Kimi no Pink to Boku no Blue

Yuuki is an aspiring musician currently working as a housekeeper. One day, he is put in charge of cleaning the house of Koudai Kikuchi, a popular fashion designer whose designs are centered around the color black. What happens when Yuuki finds Koudai's secret plushie collection room and discovers his long-held secret love for cute things?

(Source: Tokuma Shoten, translated)