Giving a spare key to your significant other in a relationship can be a big step. In certain situations, it can even become a frightening weapon! Learn about some possible results in this spare key-themed anthology!

Other titles in this book: - コスモスのつぶやき ( Cosmos no Tsubuyaki / Cosmos Whispers ) - はっぴいコレクション ( Happy Collection ) - きみをみつけた秋 ( Kimi wo Mitsuketa Aki / The Autumn I Found You ) - クラッキング・クラッカー・サウンド ( Cracking Craker Sound )