Fifteen Minutes Before We Really Date (Manga) Vol 01 (Mature)

Yuki and Natsuna live in the same apartment complex and have been childhood friends for ten years. One day on the way home, with their high school graduation fast approaching, they make a decision on a whim-to start dating! In the fifteen minutes before things get a little more serious, will their friendship finally blossom into love...? Yen Press
(W/A) Perico