Five close friends, all of them married, share a loft to meet their mistresses. One day they find the body of a young woman in the loft. Since there are only five keys to the loft, the five men begin to suspect each other of murder.

For five men, the opportunity to share a penthouse in the city -- in which to carry on extramarital affairs -- is a dream come true, until the dead body of an unknown woman turns up. Realizing that her killer must be one of their group, the men are gripped by paranoia as each one suspects another. Friendships are tested, loyalties are questioned, and marriages crumble while fear and suspicion run rampant.

故事舞台为孩子们可以自由学习并享受乐趣的阁楼上。该企划的长期目标为制作 26 集电视动画，但作为企划的起点，该企划将首先在 2023 年 10 月前制作三部“动画绘本（moving picture books）”。众筹回馈包括感谢信、动画绘本、定制化生日祝福留言、独占视觉图下载、对故事中怪兽的命名权等。