Queen of Hearts/Carroll in Wonderland

The Queen of Hearts (ハートの女王 Hāto no joō) is a major character in Carroll in Wonderland.

Timeline
In general, the Queen does not appear as frequently as other characters. She is present in the Great Hall for each meal (8:00-9:00, 12:00-13:00 and 19:00-20:00).

Day 1
The Queen is in the Great Hall after lunch from 13:00-15:00.

Day 2
From 14:00 to 14:59, the Queen is talking with Carroll in her own room at the north end of the Great Hall. If the player talked to the Nekomata earlier in the day (she can be found in Castle Gate), then Nekomata will be in the Great Hall and distract the guards. This means it is possible to approach the door to the Queen's room and eavesdrop on her conversation, revealing that Carroll is the one who delayed Reto from returning to his world.

From 16:00 to 17:59, the Queen is in Castle Gate.

Day 3
The Queen is in the Great Hall after dinner from 20:00-20:59.

Bad End
If the player talks to the Queen and picks "Talk about the Queen of Hearts", then picks "Ask to be embraced" twice, they will be offered a choice. Choose "Ask to be embraced more", then "Please adopt me" and there is a H-scene in which she gives Reto a breastfeeding handjob (reusing artwork from Succubus in Wonderland), then adopts him as her son. This is Bad End ~The Princesses' Younger Brother~, and reaching it gives the achievement of the same name.