The twelfth volume of The Wallflower was originally serialized in Bessatsu Friend in 2004 by Kodansha Comics and later published as a volume by the same company on March 9, 2005. The English version was released on August 21, 2012 by Kodansha USA.
Mori High's annual school festival is fast approaching, and Sunako's class is gearing up to perform a cosplay cafe. Sunako's roomies, the four hottest guys in Japan, are shocked when Sunako leaves the dark recesses of her room and heads out shopping with a gaggle of high school girls. However, what Sunako thought was a simple cosplay supply shopping trip soon turns into a full-blown girly event complete with karaoke, ritzy boutiques, and even a photo booth. Can the dark Sunako survive an entire day of perky pink-infested fun? Could this be her first step on the path to ladyhood?
- Chapter 47: "The True Spirit of Summer"
- Chapter 48: "The Summer Vacation of Love"
- Chapter 49: "Glorious High School Days"
- Chapter 50: "Do It for the Fried Shrimp"