Premise: Kodomo no Omocha (Japanese: こどものおもちゃ , lit. "Child's Toy") , also known as Kodocha for short, is a manga series by Miho Obana. The series was adapted as an OVA by J.C. Staff and released on December 16, 1995 by Shueisha under their Ribon Video label. An anime television series was created by Studio Gallop and NAS and broadcast on TV Tokyo every Friday from April 5, 1996 to March 27, 1998.
Hypothesis: Kodocha is Studi Gallop's biggest success.