Lullaby Days — all operations are possible with the mouse. However, some operations are supported by the keyboard, so they are easy to mix. Please ask for help inside the game. The most important quick progress is to left-click Ctrl or Shift on the keyboard or right-click. Window mode is a combination of Alt + Enter keys. The first thing you do is a big egg. With careful care, a duckling will be born, and the actions of a duckling can help change the qualities of the daughter or open her abilities. The duckling grows up to be a daughter in human form, who eventually spends 13, 15 and 17 years with you. Instead of filling a period, it is a system in which a daughter grows when a certain amount of mana is filled.