Seito Kaichou no Yuuutsu

A collection of short stories including:

• Hana no Saku Koro (When the Flowers Bloom)
  Four years ago in high school, Yoshizawa left a confession letter for Nanba in his shoebox, and asked him for the second button from his uniform if he felt the same way. But he wasn't acknowledged. He's still carrying a torch though, so when Nanba shows up on his doorstep seeking a place to stay for a week, he agrees reluctantly. But only for a week!