Azusa Yamamoto

Azusa is Daijiro's younger sister. She is involved with B Memories, a religious organization that developed a technology of halting decomposition in dead bodies using preservatives from butterfly scales, so that the bodies can be resurrected in the future when technology allows it.

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Azusa refuses to hand over her brother's body to be cremated, taking it with her to B Memories. She also sets up, or at least intercepts, group meetings with people who want to commit suicide, recruiting them into the cult.