What is "re-kan!"

is a Japanese four-panel manga series by Hinako Seta, serialized in Houbunsha's Manga Time Jumbo magazine. Re-Kan! was first published as a one-shot in Manga Time Jumbo December 2009 issue, and it later began serialization with the February 2010 issue. It has been collected into four tankōbon volumes. An anime television series adaptation by Pierrot+ aired in Japan between April and June 2015.