Mysterious Girlfriend X Volume 1 features story and art by Riichi Ueshiba.

Mikoto Urabe is a new transfer student in Akira Tsubaki’s high school class. One day, Akira happens to find Mikoto passed out asleep on her desk after classes have ended. He wakes her and tells her it’s time to go home, and discovers that she has drooled on her desk. He spontaneously reaches out to touch and taste it… and then things start getting really strange.

In this surprising and sweet twist on a high school romance story, boy meets girl and they learn about each other’s inner life through their highly unusual bond, and Akira learns to respect Mikoto as she sets a careful pace in the development of their relationship.

Mysterious Girlfriend X Volume 2 features story and art by Riichi Ueshiba.

As the school year progresses and the seasons change, Tsubaki and Urabe’s unusual relationship continues to grow and change as the two learn new things—both mysterious and mundane—about each other. Then one day Tsubaki discovers a popular idol who bears an uncanny resemblance to his girlfriend…

Mysterious Girlfriend X volume 3 features story and art by Riichi Ueshiba.

Tsubaki’s old crush, Hayakawa, had been surprisingly okay with his request to taste her drool. In a fit of conscience, Tsubaki stops himself in time, but that leaves Hayakawa wanting a chance to win back Tsubaki’s attention, and so she cooks up a plot to bring both Tsubaki and Urabe to the Hoshinome Girls’ Academy’s eccentric culture festival…