However, the central conflict arises when it’s revealed that , the man who deeply hurt her. The ex-boyfriend had manipulated and abandoned her, leaving her unable to trust love. Shohei knows this history but still wants to be with Hinata, hoping to prove that he is not like his brother.

One day, a man named walks into her bookstore. He is bright, talkative, and somewhat clumsy — the complete opposite of Hinata’s usual type. Despite her reluctance, he begins to visit the store frequently, and a slow, tender friendship develops.

It sounds like you’re looking for the of the manga "Soredemo, Ashita" (それでも、明日) as found on Rawkuma (a site known for manga raws or translated chapters).