Girls' Next Tour (A Girls' Last Tour fan-sequel)

Following the day after they reached the top of the world, Chito and Yuuri are faced with a life or death decision as they decide to journey towards the center of the mysterious layer.

SPOILER ALERT:
The story continues right after the ending of the Girls Last Tour / Shoujo Shuumatsu Ryokou manga!

(Girls Last Tour, Shoujo Shuumatsu Ryokou fanfiction)