younger brother is actually more capable than the older brother but he held back because older brother want to have superiority. they made a promise that if the younger brother beats the older brother in test, he will grant his wish which is to allow him to touch him. the older brother hated the younger one for always copying and glaring at him. but in truth, the younger one did all that to make him a good brother and son in their parents' eyes.
Soukyoku (MEGU Iroha)