Deadscream Bloody Mary is a tranquility girl planted by Aqua in the garden behind the party's mansion
Before the party leaves to help Yunyun complete the Crimson Demon Chief trial, Kazuma and Darkness again attempt to remove Deadscream Bloody Mary after forgetting she existed. Eventually, they decide to plant the monster in the Crimson Demon Forest. They introduce her to Yunyun as the one who will eventually become chief of the Crimson Demon Forest.
When the party introduces her to Komekko, Komekko views her as a snack and drools.
The party eventually ends up planting her at Megumin's family home. Deadscream Bloody Mary reveals that she is already able to comprehend human speech and can speak. Kazuma attempts to convince his party of its advanced intelligence, and eventually Komekko causes the monster to cry out in fear by commenting on how she, "Looks tasty."