Note: The synopsis provided appears to belong to a different series, not Wind Breaker. Wind Breaker is a contemporary street-fighting manga set in a fictional Japanese town, centered on a delinquent who joins a gang that secretly protects the local community.

That said, here is a blurb based on the synopsis you provided:

A man with no memory finds himself folded into the ranks of what will become the legendary Shinsengumi, navigating identity and loyalty as Kyoto transforms around him during the final turbulent years of the Edo period. The story grounds its personal drama in one of Japan's most romanticized historical moments, making it a natural companion for visitors drawn to Kyoto's Shinsengumi sites and museums. By the time the protagonist reclaims his past, the country itself has already moved on without him.