The manga series Mysterious Girlfriend X (Nazo no Kanojo X) by Riichi Ueshiba began serialization in Futabasha's Manga Action magazine.
Announcement that Mysterious Girlfriend X would be adapted into an anime television series.
The anime television adaptation of Mysterious Girlfriend X premiered in Japan.
The 13-episode anime series of Mysterious Girlfriend X concluded its broadcast in Japan.
The manga series Mysterious Girlfriend X concluded its serialization.
Ryouko Asakura joins Sakurai and Akira's class, starting the events that lead to their unique connection.
Akira Sakurai tastes Ryouko's drool for the first time, establishing their mysterious bond.
After various events, Akira and Ryouko officially become a couple, cementing their unique relationship.
Akira begins to carry Ryouko's drool to feel connected to her even when not together.
Their relationship deepens as they share more experiences, including mutual understandings and acceptance of each other's quirks.
Akira feels embarrassed about their relationship and the drool, causing moments of tension.
Some classmates become suspicious or aware of the mysterious connection between Akira and Ryouko.
He begins to accept the uniqueness of his relationship and becomes more open.
