The phrase (loosely translated as "I shouldn't have gone to the fan convention without telling my wife") refers to a specific sub-genre and narrative trope within the Japanese "doujin" (self-published) and adult media community.
As he was about to leave, one of his colleagues noticed him and approached. "Taro, long time no see! Glad you could make it," he said with a clap on the back. Just then, a text popped up on Taro's phone. It was from Yumi. tsuma ni damatte sokubaikai ni ikun ja nakatta verified
These events are typically announced on weekday mornings or early Saturday hours. They require planning, queuing, and often a lie about “going to a convenience store” that spirals into a half-day disappearance. "Tsuma ni Damatte Sokubaikai ni Ikun ja Nakatta"