[Mitsuya] Chav Male To Female Sex Change by Way of Going to Another World [akanameTL]

A wild isekai mishap transforms a rough-around-the-edges man into a voluptuous woman, and the story wastes no time putting her new curves to the test on a train ride gone haywire. Surrounded by eager strangers, the protagonist's soft, ample body becomes the center of a chaotic encounter complete with toys and a double-barreled finish. By the time the gang hops off and heads for lunch, the trip to a supernatural world has clearly left its mark on more than just her body.