Sea-Song6
A father (named K, real name kept secret) hasn't seen his wife or daughter (their names also kept secret) in over a week. He quits his job as a salaryman to go inside the kindergarten his daughter went to (the "Garten of Mukku") where his wife also went missing. The kindergarten is dimly-lit and is a giant "liminal space" labyrinth of many rooms, yet it doesn't look too scary - cute mascots (Gachapin the green dinosaur, Mukku the red yeti, and Pipo the Flamingo) adorn the walls as decals with cute quotes. K discovers and uses a drone and remote controller throughout the premises, helping him press certain buttons from afar (and he also finds and utilizes some keycards to unlock doors). Inside of a children's play room, he sees Pipo the Flamingo with her mouth wide open, and a sign says "Feed Pipo five eggs and you'll get a prize". K finds all the eggs and gives them to Pipo, which she swallows whole. Everything seems peaceful for now, and a door is unlocked as K's "prize". What happens next will be revealed in chapter 2.
Character info: Gachapin, Mukku (from Hirake! Ponkikki TV show) Gachapin the Green Dinosaur and Mukku the Red Yeti are both male. Pipo is a female flamingo OC. The story and events are based on https://gartenofbanban.fandom.com/wiki/Garten_of_Banban (the first game).