Based on the hit-game by Key, each volume focuses on one of the five heroines of the game in this order:
1. Yuki no Shoujo (Girl in the Snow) --> Nayuki
2. Egao no Mukougawa ni (Beyond the Smile) --> Shiori
3. Shoujo no Ori Girl's Prison) --> Mai
5. Hidamari no Machi (A Sunny City) --> Ayu