Product typeVisual novels, Erotica, Eroge
IntroducedNovember 26, 1999
TypeYūgen gaisha
IndustryInteractive entertainment
Brand novelties
FoundedMarch 1997[1]
FounderAkio Ōnuma
Kanda, Chiyoda, Tokyo
Area served
Key people
Akio Ōnuma (CEO)
Kimihiko Iwasaki (Director)[1]
ProductsWelcome to Pia Carrot!! 2
School Days
Summer Days
Cross Days
Number of employees

0verflow (オーバーフロー) (stylized 0verflow) is a Japanese video game division of Stack Ltd. (有限会社スタック) specializing in the production of mature interactive fiction.[2] The Overflow label is known for its game franchise School Days.[2] Stack's headquarters are located in the Sugishō Building (杉商ビル) in Kanda, Chiyoda, Tokyo.[1] On February 10, 2012, Overflow confirmed that Shiny Days, a remake of Summer Days, will be the last title produced by the brand.[2] The team also reassured customers that it was not going bankrupt and would continue to support their line of video games even after the release of Shiny Days.[2][3]

Overflow's PureMail video game was adapted into a two-episode OAV in 2001.

Overflow's Imouto de Ikou! video game was adapted into a two-episode OVA in 2003.

Overflow's School Days video game was adapted into a 12-episode anime series in 2007.[2] 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.



Overflow produced such games as:[4]


Stack was involved in games such as:


  1. ^ a b c d "About Us" (in Japanese). Stack Ltd. Archived from the original on 2009-12-01. Retrieved 2009-11-01.
  2. ^ a b c d e "School Days' Overflow Confirms It Is Making Its Last Title". Anime News Network. February 10, 2012. Retrieved November 30, 2012.
  3. ^ Lanson, Greg (2012-02-11). "'School Days' Creators 0verflow Announces 'Shiny Days' will be Final Game". Crunchyroll.
  4. ^ "Overflow's Product List". Overflow. Archived from the original on 2012-11-30. Retrieved November 30, 2012.
  5. ^ "School Days to Be Posted on Crunchyroll This Spring (Update 2)". Anime News Network. 2009-04-24. Retrieved 2012-01-24.
  6. ^ "Notice about change of release date for Shiny Days". 0verflow. February 10, 2012. Archived from the original on 2012-03-10. Retrieved March 6, 2012.

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