やっちまったらごめんなさい! [Yatchimattara Gomennasai!]

A single-issue 1998 comic from Hakusensha, Yatchimattara Gomennasai! is a brief, self-contained story from a creator known for their work in the publisher's shōjo and josei magazines. Its title, roughly translating to "I'm Sorry If I Messed Up!", hints at a comedic or regretful premise, but the series' significance lies in its status as a one-shot—a complete narrative released as a standalone issue rather than a continuing serial.