S1·E101 Clash! Tiger and Hawk!!

While taking a break from practice, Inazuma Japan receives letters from their friends and families from Japan. Everyone is happy, except for Toramaru. For some reason, he's been acting strangely after he received his letter, and lose focus in practice. He even lashes out at everyone during dinner. Endō decides to go talk to him, but to everyone's surprise, Tobitaka wants to go instead. How will he solve this problem? And why was Toramaru so agitated?