Was originally a one-shot in Afternoon in 2004 before it became a series in 2006.

One day, a strange transfer student appears before Tsubaki. Urabe Mikoto is an antisocial girl, whose hobby is just sleeping during class-breaks. One day, Tsubaki goes to wake her up and accidentally tastes her drool... And gets hooked on that!

After that, he starts going out with her and gets to know her better. Her second hobby, as it turns out, is carrying around scissors in her panties and cutting paper into flowers...

This is a cute, funny and sweet romantic comedy.... And Urabe Mikoto is a really "Mysterious Girlfriend" XD

I split the largest volumes into Separate zip files (So you don't need to download both the parts and extract)....

Download Links:

Volumes:

Volume 01 (Ch. 000-004) - Part01 - Part02
Volume 02 (Ch. 005-012) - Part01 - Part02
Volume 03 (Ch. 013-020) - Part01 - Part02
Volume 04 (Ch. 021-028) - Part01 - Part02 - Part03

Chapters:

Mysterious Girlfriend X - Chapter 29.zip
Mysterious Girlfriend X - Chapter 30.zip
Mysterious Girlfriend X - Chapter 31.zip
Mysterious Girlfriend X - Chapter 32.zip
Mysterious Girlfriend X - Chapter 32.5(Extra).zip
Mysterious Girlfriend X - Chapter 33.zip
Mysterious Girlfriend X - Chapter 34.zip
Mysterious Girlfriend X - Chapter 35.zip
Mysterious Girlfriend X - Chapter 36.zip (New!!)