Kizuato Renai: Tokimeku Mune ga Nai to Shite mo

Risa, who was diagnosed with breast cancer at a young age, tries to restart her life, which had come to a halt while she hid her illness, by changing jobs. Her work is praised by her boss and her new job is off to a great start, but she's forced to work with a careless playboy.

(Source: Souffle, translated)