Zig Zag.

Zig Zag is a Japanese shōjo manga written and illustrated by Yuki Nakaji. The series revolves around the lives of a group of students living in Kazami Dormitory of Seifu Private School in Japan. It mainly focuses on a boy named Takaaki Asakura (nicknamed "Taiyou" (the sun) for his sunny and cheerful disposition) and his affection for flowers.