Midori no Shoujo

Part of Hakusensha's Saishuu Sensou series (not to be confused with Akita Shoten's), which consists of the following (4 volumes total): 1. (冬の円盤) 2. (西の22) 3. (自我系の暗黒めぐる銀河の魚) 4. (緑の少女)