Shoujoka Kenkyuu Shitsu Twintail Buchou

Historia

"This pretty little girl... is actually a middle-aged man with a wife and kids!?" Gregory, a sales manager at the major pharmaceutical company Dokuryu Group, accidentally transforms himself, along with the Chairman and the Executive Director, into "cute girls" after trying out a newly developed energy drink! If he can't change back, he’ll lose his beloved wife and daughter—a future he simply cannot accept! To find a solution, Gregory signs a contract with the company to fully cooperate with their "Girlification Research" using his own body as the test subject. Rejuvenation? Girlification?

Sinopsis vía AniList (en inglés).