Yūki Atagawa is a cheerful, positive individual with a distinctive physical presence at 170 cm tall and 90 kg. His core motivation involves transforming into a beautiful woman as part of a revenge scheme against his cousin's ex-boyfriend. This plan drives his story segment, a lighthearted comedy exploring themes of personal change and societal beauty perceptions. His journey centers on this physical and identity shift, positioning him as a "cheerful heavyweight" protagonist whose actions propel the comedic premise forward.