The game centers on a male protagonist—the eponymous Bobby—who lives with his mother and three sisters. The primary gameplay loop involves navigating daily life within the household, managing relationships through various dialogue choices, and progressing through "corruption" paths to unlock intimate scenes with the female cast members. Key features of the saga include:

As they reached the server room, Lila quickly located the file. It was encrypted, but she got to work on cracking the code. Bobby and Vector kept watch, their senses on high alert.

The reception has been polarizing. Long-time fans of the "slice of life" aspects feel the shift toward psychological horror (the ruin exploration includes two jump scares and a disturbing diary) is a tonal whiplash. Conversely, players who have been following the game’s underlying mystery since v0.8 are ecstatic.