YKK.wiki is a collaborative fan wiki dedicated to Yokohama Kaidashi Kikou, the science-fiction manga written and illustrated by Hitoshi Ashinano. The site brings together information about the series, including its storyline, characters, locations, and related media. Its community-edited format lets users create and update articles, with a beginner’s guide and lists of translation and link issues to help contributors get involved.

The wiki also serves as a reference for the franchise’s publications and adaptations. Its catalog covers manga volumes, art and postcard books, a novel, two original video animation series, and related music CDs and soundtracks. The series follows an android running a coffee shop in a world shaped by ecological collapse, and is known for its understated artwork, measured storytelling, and engaging characters. Readers can explore the main page, browse recent changes or random articles, and consult site tools such as special pages and page histories. YKK.wiki is an informational community resource rather than an official publisher or retailer; its content is available under a public-domain dedication unless otherwise noted.