I'm looking for a fantasy manga where after the main character defeats the demon king, he ends up going forward in time. He also has some sort of guild related to moons that he can "shrink down" and take with him. The guild/shop idolises the mc's past actions of defeating the demon king but I don't think they know it's actually him. The guild place was originally his and has a room full of swords because he likes to blacksmith.
I also remember a plot point where he went to see an old friend, on the verge of old age, after they thought the main character was dead. They fight later on because the main character's friend wanted to go down in a battle instead of dying from old age.
I remember reading it less than a year ago and it feels like an isekai but I don't think that the character was ever transported into another world.