The protagonist, Kenji, is living with his adopted sister Yuki, who admires her older brother and harbors a slight secret crush on him. One day, after a certain night, a girl - Hiyori, their childhood friend - begin to appear in Kenji's closet. Moreover, her body is transparent, and she has gaps in her memory. As they struggle to figure out the mystery behind Hiyori's state, Kenji begins to realize his forgotten feelings and Yuki suffers with her secret. [From [url=http://en.wikipedia.org/wiki/Mizuiro]Wikipedia[/url]]

As the title implies, the game focuses on Mahjong and was released in celebration NekoNeko's 5th anniversary.

It’s a city that is adorned by snow. Snow preoccupies the landscape 5 months of a year. Within those months, people’s relationships also changes bit by bit. As far back as I can remember, everyday of my childhood was fun. But the truth is, even a tiny difference in how I ran my life, perhaps a mismatched button and I would probably not have arrived at the present me at all. The November of this year will see snow start to fall like every other year. But this year… this year perhaps maybe somehow, something about us will be different… [From [url=http://visualnovelaer.wordpress.com/2011/11/29/nekoneko-soft-gives-lolicons-a-greater-hope-for-the-future-with-yukiiro/]Aaeru's Blog[/url]]

Desert lands in the ancient times. There was a legend about entity called Ruta who bestows various magic-like abilities upon his disciples along with vermillion gems. Story begins to unfold with the adventure of two people -- Aramis, young girl from the Ruta clan, who can erase people's memories, and Kadan, her guardian. There are four chapter in the novel, that are connected by the same setting.

Contains omake (bonus) material related to NekoNeko's earlier games.