A younger sister looks down on her brother who got fat. However, her brother suddenly started dieting, and she's bewildered at the sight of him who has changed! A heart-pounding, warm and fluffy comedy of stepsiblings on a diet! (Source: Amazon)
Steadily Changing Stepbrother and Stepsister is an ongoing manga by Tatsubon, first published in 2023. It blends romance, comedy, sports and slice of life. You can read all 13 available chapters of Steadily Changing Stepbrother and Stepsister online for free on MangaPulse; the newest is Chapter 4, added 2023-09-21. New chapters appear here shortly after they're released.