Happy Math"Problem of Pursuit" is a kind of mathematical problem. It involves calculating how much time is needed for an object to chase down another object.The setting of the problem is interesting.C is already dead!?Sakuya~ What are "Problems of Pursuit"?For example, A and B were running toward the Big Bad's castle, then the last survivor of the Big Bad's Elite Four appeared before them. So B told A, "Go on, I will hold him off!".How many minutes does B need to catch up with A?Too much useless information, and B is definitely going to die.Of course, A refused. "There's no way I will leave you behind!". But B said: "Didn't you promise C you will protect the world! Are you spitting on his sacrifice? Don't worry, I will take down that bastard and catch up to you in no time!""If anything happens to me, give this to Miss D." After that, B threw his locket, a gift from his parents, toward A......So A ran toward the Big Bad's castle while muttering "Don't die, you idiot...."