She lives with her mother while in elementary school.
While acting strong and not worrying about my mother, a half-boy who lives next door
'I will be my brother' Thanks to him for promising me, his loneliness was mixed.
In school, he always fell in love with Noah, who was close to him than needed, and Hikari was mocked by her sister.

She becomes a college student, and her mother and Noah's father are officially married!
I'm happy, but both in name and reality, Noah and 'brother' I am shocked that it will end up.
But Noah's skint gets more intense, finally kissing her lips, her tongue in...?