Responses
in oujisama game its the 3rd and 6th not the 6th and 7th. and its not yuri and reins brother that is sent to the other kingdom. he is sent from the other kingdom to theirs and is with yuris older brother. you should re read them.....
This manga has 2 prequels.
1- Oujisama Game tells the stories of Yuuri and Rein brother's (the 1st, 6th, and 7th)
2 - Ousama Game Yuuri and Rein 2nd brother is sent to another kingdom. Where he meets with the king and the kings brothers (This manga also tells the stories of the brother's from the new kingdom)