June 1st will see the publication of the first Mysterious Girlfriend X Light Novel!
The novel will be written by Chihaya Satō and illustrated by the mangaka - Reach Ueshiba.
Mysterious Girlfriend X: Mysterious Novel Version is about a strap (...maybe a phone strap?) that will bind a couple together forever if it can be given from one partner to the other without the receiver realizing the love power it possesses, i.e. it's a secret. Sounds like it causes series protagonist Tsubaki a lot of grief over the course of the story.
I love the fact that this is not an adaptation, but an addition to the story! More manga should have light novels that add to the story! (We already have two adaptations of the main story, after all!)