The year is 1889. Four siblings — Mio, Peet, Max, and Beretta — find themselves responsible for their late father's toy business. Running it means doing two things simultaneously: scouring the town for materials to build each toy, and collecting orders from shops and residents before those requests expire. Materials add weight to inventory and drain stamina as the day's demands stack up. Filling a request on time generates revenue; missing the window loses the contract. Managing energy, materials, and the workshop across each day is the central challenge.