Pure-hearted Gyaru and the Shape of Happiness

When the protagonist "Yota Kawara" was young, he promised to marry his childhood friend in the future. Several years later, Yota returns to the place of his memories at Shiou Gakuen. "... Is that you, Yota? You haven't changed at all. Oh, you know who I am, right?" Yota's excitement about his new life at school is in disarray, when he is reunited with his childhood friend who is now a "Gyaru"... Just how will the girl who loves the protagonist even after her makeover, and our troubled protagonist's relation turn out? Will they be able to find their shape of happiness?