Mysterious Girlfriend X (Nazo no Kanojo Ekkusu) is an ongoing Japanese manga written and illustrated by Riichi Ueshiba. It originally was published as a one-shot story in 2004 before becoming a serialized comic in Kodansha's Afternoon magazine in 2006. An anime adaptation by Hoods Entertainment aired in Japan from April 7, 2012 to June 30, 2012, with an original video animation episode released on August 23, 2012.
PLOT
Akira is a normal high school boy, but he nevertheless impulsively licks some drool left by the mysterious transfer student Mikoto. The next day he falls asleep with an inexplicable fever. After five days Mikoto suddenly comes to visit, and makes him consume her drool. The fever instantly vanishes, and Mikoto explains that he's suffering from "love sickness." She can transmit emotions through her drool, and the two of them are now bound together.
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