Sequel to How Could You, Grandpa. After few days returning to the academy, Ruka finally found out about Natsume and Mikan's relationship. He's still denying his feelings towards Hotaru. In his confusion, he received a letter which wrote him a permission granted to visit his mom. Will he find the comfort he seeks? Or will the ice queen made HIS LIFE MISERABLE again?

Some students of the academy were missing.With Mikan,Natsume,Ruka and Hotaru left to solve it. As they investigate they found the truth which came out of the 'blue'.