From Shinkirou Scans:

After suffering a disappointing heartbreak, Hanamura, an employee in a manufacturing company, meets Takase, the famous designer who works in collaboration with his company. It doesn’t take long for Takase to highlight Hanamura’s talent, as it doesn’t take much time to seduce him both physically and mentally. The both of them start a relationship and Hanamura, who is completely captivated, ends up resigning to enter the company Takase manages. Due to the arrogant personality of his new boss and his bad reputation as an insensitive man, distance grows between them and Hanamura is unable to break through it...
“First day with my boyfriend” and “Let me stay by your side” are also included.