(stylized 0verflow) is the adult game brand of Japanese video game company known for its School Days franchise. Stack's headquarters are located in the in Kanda, Chiyoda, Tokyo.
0verflow's PureMail video game was adapted into a two-episode OAV in 2001.
0verflow's Imouto de Ikou! video game was adapted into a two-episode OVA in 2003.
0verflow's School Days video game was adapted into a 12-episode anime series in 2007. Both School Days and Cross Days have also received manga adaptations.
Stack's Welcome to Pia Carrot!! video game series was adapted into a three-episode hentai OVA from 1997 to 1998. Its sequel, Welcome to Pia Carrot!! 2 was adapted into a three-episode hentai OVA from 1998 to 1999, and a six-episode OVA titled Welcome to the Pia Carrot!! 2 DX from 1999 to 2000. The video game also received an anime film titled Welcome to Pia Carrot!! -Sayaka no Koi-monogatari- in 2002. The Pia Carrot series later served as the primary inspiration for 0verflowâÂÂs own Radish series (including Summer Radish Vacation!! and Snow Radish Vacation!!). These titles are considered parodies of Welcome to Pia Carrot!! 2, featuring similar restaurant settings and character designs. Most notably, the character Mai Kiyoura is a direct homage to Pia Carrot 2 heroine Hinano Uzuki, even sharing the same voice actress, Kozue Yoshizumi.
On February 10, 2012, 0verflow confirmed that Shiny Days, a remake of Summer Days, would be the last title produced by the brand. Customers were told that the company would continue to support their line of video games.
0verflow produced such games as:
Stack was involved in games such as: