makes me wonder if they are a pair, maybe the marisa was a pet, refreshed with the yukkuri and did the typical "take care of her as well because i say so or she's coming to live here you get out!" bad pet statement. The owner did an owner on the stray yukkur and the marisa, maybe after a beating or something, got a better treatment and was left in a box, next to her "wife" as a memento of why she's there.