Floating Light Forest is the Monthly Sign-In set given to the player during their 23rd month logging in to Love Nikki. It does not have an official completion award as it is not in the gallery, making it a Hidden Suit.
The items Silent Snow Fall (Accessory No. 2201), Moon Whisper (No. 2202), and Snow Moment (No. 2204) were likely intended to go with this hidden suit, as they contain similar styles and numbers adjacent to the suit's bracelet (No. 2203) and the foreground (No. 2200).