When you start the game on a specific calendar date (the date set on your device), the game celebrates the real life or fictional celebrations by playing a short mini event.

Examples:
* Starting the game on Feb 14 (Valentine's Day) will play a scene of a heroine giving you chocolate;
* Starting the game on an in-game heroine's birthday will play a scene of you wishing the happy birthday to her;
* Starting the game during New Year will show you receiving greetings from the heroines.