Help me find the name plss

Ok so it's a school where the students need to find a card if they found a king card they rule the school something like that

Anyways the mc who always gets the higher card has a loyal dog who's into him at the end of the day he didn't get the higher card so he end up being slave while the "loyal dog" got to have the good card and end up slaving mc and so on sorry for the bad explanation but that's all i could remember it's also bl so please help me （/TДT)/