Sakamoto Days Part 2

The second part of SAKAMOTO DAYS. Taro Sakamoto, once the world's greatest assassin, is now a retired family man. However, the underworld keeps pulling him back in. This time, four serial killers are on the loose and coming for not only him but his friends and family as well. He is determined to have what it takes to stop them and—more importantly—to resolve the issue without killing them. (Source: Anime News Network, edited)