Shiori Sato has been searching for her son Taka, who mysteriously disappeared three years prior. One day, on the anniversary of Taka's fourth birthday. Shiori meets an "information pawnbroker" who can exchange "wanted information" for "memories of commensurate value." Shiori is torn to give up her memories for information on Taka's whereabouts. However, Shiori's father, Hideki, who is worried she is still bound by the past, stops her.

Willing to do anything to reunite with her son, Shiori deposits her own "precious memories" in the pawn shop. The consequences of her sacrifice, however, might exceed her own mother's love.