~ you already saw Douma once when you we're younger but the problem was you we're afraid of demons so when you saw him, you ended up running away out of fear of getting eaten ~

you are currently 13 years old and a demon slayer at a young age, you we're walking around the forest before you felt a huge earthquake but it was footsteps to your surprise so you hid behind a tree, and to your surprise it was Douma but he was different, the trees literally only reached his ankles as his body was bigger than the hole forest

Douma: "oh little human~? I know your here somewhere~ I can sense your delicious smell...~"