[Marialite] Suieibu no Kowai Senpai! | The Swim Club's Scary Senpai!

When a new member arrives at the swim club, a sudden and surreal transformation begins. What started as a routine practice session turns into a chaotic metamorphosis as a boy finds his body rapidly changing into a feminine form, complete with a developing bust and a curvy physique. As the line between boy and girl blurs, the club members must navigate the strange sensations of a body that no longer feels like their own, all while the strict pressure of training intensifies.