Ikotsu no Tabiji

At his brother's funeral, Kasuka Tokio catches a man stealing the ashes of his deceased sibling, Hajime. The intruder, Kuroki Ren, explains that he had made a promise to Hajime to take a trip together and wants to fulfill it using his remains. Moved by Ren's words, Tokio offers him one of his brother's bones, but only if Ren agrees to a condition.