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Don't regret.
Do everything you can while you still have the chance.
That's what I think it means...
...to have a "happy heart."

Story and Art by Yuuki Obata
Release May 4, 2010
ISBN-13 978-1-4215-2027-8
eISBN-13 978-1-4215-6164-6
Trim Size 5 × 7 1/2
Imprint Shojo Beat
Length 192 pages
Category Manga
Age Rating Teen Plus