Mysterious Girlfriend X

"Mysterious Girlfriend X" (Japanese: 謎の彼女X, Hepburn: Nazo no Kanojo Ekkusu) is a Japanese manga series written and illustrated by Riichi Ueshiba. It was originally published as a one-shot story in 2004 before becoming a serialized comic in Kodansha's "Monthly Afternoon" magazine from 2006 to 2014, with 12 tankōbon volumes. The series follows the unusual, somewhat erotic romantic relationship between high school student Akira Tsubaki and the mysterious transfer student Mikoto Urabe. After a series of strange events, Tsubaki becomes addicted to Urabe's drool, which she calls 'love sickness.' Their relationship progresses slowly, focusing on the odd friendship and behavior that stems from this unusual attachment. The manga was adapted into a 13-episode anime series in 2012, produced by Hoods Entertainment, and included an OVA. The anime was streamed by Crunchyroll and licensed by Sentai Filmworks in North America for home video distribution. The series is noted for its unique plot and exploration of adolescent romance and physical intimacy.