Kiss Made No Kyori (Yoshinaga Yuu)
Other titles :
キスまでの距離 (YOSHINAGA Yuu), 接吻的倒數距離
Author(s) :Yoshinaga Yuu
From Chibi Manga: Kaji, Yuzuha's unrequited love, is a good friend of her younger twin brother Hayao. He's the same age but goes to a different school and since theyre in elementary, he's been going in and out of Yuzuha's home. She's been in love with him all the time, but can't make a serious face when around Kaji. Now they both change to the same high school and there's the chance to decrease the distance between Kaji and her...!?