Ginga Densetsu: Requiem

After the fierce battle in Echigo, the members of the Oshu Army were living peaceful days in the dog paradise of Futago Pass. During the scorching heat of summer, a dog appears before the Oshu Army, asking for help from a bandit's rampage. Weed and his men immediately depart, but Gin's age is showing as he sees him off... An ominous atmosphere slowly builds as the final battle of the Ginga looms!!

(Source: Nihonbungeisha, translated)