becoming rengoku in project slayers

I think the story book might be located in a special vendor's shop. Sometimes, these unique items are sold by specific NPCs. Or, it could be a reward for completing a challenging side quest.

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.

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.

Tanjiro would be a great character to pair with rengoku. Their different personalities could create an interesting interaction. Tanjiro's kind - hearted nature and rengoku's fiery determination could lead to some great storylines.

Rengoku remains deceased in the manga. His character's fate is set, and there's no resurrection. It adds depth and gravity to the narrative.

The Eight Fairy Slayers was a modern novel written by Nine Yin Fighting for the Stalk. The storyline and character introductions of Celestial Bane were not clear. It might be a novel with the theme of Xianxia, which included eight female characters. However, the specific storyline, background, and other details could not be learned from the search results provided. Therefore, I can't provide any more information about the Eight Celestial Slaying Ladies.