Orehiki: I'll Break Away From My Meaningless Life summary:

Shigesaburou's life up to now has been a lot to deal with, but after he abandons his duty and decides to live as a ronin, he has to figure out what matters to him the most. Meeting new friends and finding his place in this world seems easy enough, right? At least until his naivete is challenged by complicated relationships and grievances at almost every turn... in both the past, and the future.