Reach Ueshiba's Mysterious Girlfriend X manga, currently on air as an anime, is being turned into a light novel. Written by Chihaya Satō, the book is illustrated by Ueshiba.
Urabe's drool powers at work in novel form
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.
The book will be released June 1st in Japan by Kodansha. Who would read it if it got translated into English?