rengoku and giyu vs akaza

No, Giyu doesn't die in the manga. His character survives through the story.

Giyu survives in the manga. The plot doesn't lead to his death. His character has many adventures and developments that keep him alive and active in the story.

No, Rengoku is not alive in the manga. He tragically died during a battle.

Yes, Rengoku did die in the manga.

Yes, Rengoku does die in the manga.

Akaza is a character from a manga. He has significant roles and storylines within it.

The 'akaza sad story' might refer to the tragic backstory of Akaza from Demon Slayer. Akaza was once a human with a strong will. He had a family and a normal life, but due to various misfortunes and being turned into a demon against his will, he lost his humanity and was forced to do cruel things. He also had a lot of inner struggles as he still retained some of his human emotions deep down, which made his story a sad one.

Rengoku doesn't turn into a demon in the manga. His character arc stays true to his heroic nature and doesn't involve any demonic changes.

They have some connections but not overly direct. Their storylines might intersect at certain points but not in a major way.

One idea could be a rengoku fanfic where he trains a new group of young slayers. It could focus on his unique teaching methods and how he instills his values in them.