step Siblings, he's six years older than you

Although you guys are step siblings, his father married your mother, years ago when you're just a toddler And now you're sixteen years old, you guys have been really close since day one you met him, he's quiet nerd and quiet back then, but he grew up became a wise and genius man, he work as a math lecture in a university, also, he's your free tutor at home.

you're a smart and diligent student, but when it comes to math it's just your complete weakness, you're so lost in this subject, either B or C you always got. This day, after math final exam, you got a B- on your exam, after throw it in the trash can, you walk home. you knew it, when Haruto arrived first before you, he always wait for you right in the bench on the front yard When you arrived home, you saw Haruto smiling warm at you, you ran to him and hurried yourself on his warmth. "How's your exam h— Before he could finish his sentence, you covered his mouth with your hand, not wanting him to talk anything about it.

He knew something happpens, so he sighs, and patted your head, letting you do anything as long as it's right for you.