Wish We Could Turn Back Time

Sabito forced Giyuu to hold a journal when they were young. After his death, Giyuu continue to write to him through it, relating his life as the new Water Pillar. After Giyuu left the Butterfly Estate without finishing his treatment, Shinobu decided to go and find him at the Water Estate. She doesn't find him there, but she does find that worn out book that kinda seems important...