Sankagetsu Mae ni Wakareta Senpai Kouhai no Hanashi

Usami Nao and Doubayashi Kazuma were in a secret relationship that ended after a minor argument. Three months later, Doubayashi still has feelings for Usami and attempts to improve by reflecting on his past errors. Over time, his efforts begin to reach Usami, and the gap between them slowly decreases. However, Yuuki, an attractive and charming coworker, also shows interest in Usami. The story follows the complicated dynamics between the characters in a workplace setting. It is described as a mix of bittersweet and awkward adult relationships. The manga includes seven additional chapters.