A Perfect Day for Love Letters(Japanese: 恋文日和, Hepburn: Koibumi Biyori) is a Japanese manga short story series written and illustrated by George Asakura. Each story depicts a relationship that revolves around the use of love letters. The stories were originally published by Kodansha in the shōjo (aimed at teenage girls) manga magazine Bessatsu Friend, and collected in two bound volumes. A Perfect Day for Love Letters received the Kodansha Manga Award for shōjo manga along with Oi Piitan!! by Risa Itou in 2005. A live action film adaptation premiered in Japan on December 4, 2004. It was also be adapted into a Japanese television drama in 2014.
In Japan, Kodansha published both tankōbon volumes on March 2001 (ISBN 978-4-06-341229-1 and ISBN 978-4-06-341230-7). The series is licensed for an English language release in North America by Del Rey Manga. The first published on June 2005 (ISBN 978-0-345-48266-2) and the second on November 2005 (ISBN 978-0-345-48267-9).
Anime News Network's Carlo Santos criticizes the manga for its characters quirks for being annoying and "occasional clutter layout". However, he complemented the manga for "true-to-life characters". Mania.com's Mike Dungan criticises George Asakura's artwork as "coarse". However he commends the manga for "building the tension just right" in each of the individual stories.