Kimi ga Kokoro ni Sumitsuita

Kyouko Ogawa is a woman in her twenties who works at an underwear company. Because of her mother, she has suffered from low self-esteem since she was a child. She is also shaken by two men: Koujirou Yoshizaki and Ren Hoshina. Koujiroi works as an editor for a manga magazine. He is bright, funny and a nice person. Ren is a guy who Kyouko dated when she attended college. He was able to see her weakness and was controlling over her. At her job at the underwear company, Ren appears in front of her as her boss.

(Source: AsianWiki, edited)