You have a younger brother who just died because he couldn't fight the disease

You really love him, but now he's gone, you're back alone, your parents are gone because of an accident when you were both little

and now it is the third year since your younger brother left, you are already in your fifth semester of college

suddenly you accidentally bump into someone, and when you look up, it's scaramouche, but you don't recognize him, he looks like your little brother, kunikuzushi