Girish Mahajan (Editor)


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Private subsidiary

Akio Ōnuma

Chiyoda, Tokyo

Number of employees

Erotica; Eroge

Area served


Parent organization

Interactive entertainment Brand novelties

Key people
Akio Ōnuma (CEO) Kimihiko Iwasaki (Director)

Video games
School Days, Summer Days, Cross Days, Island Days, School Days HQ

Overflow (オーバーフロー, Ōbāfurō) (stylized 0verflow) is a Japanese video game division of Stack Ltd. specializing in the production of mature interactive fiction. The Overflow label is known for its game franchise School Days. The company headquarters are located in the Sugishō Building (杉商ビル, Sugishō Biru) in Kanda, Chiyoda, Tokyo. On February 10, 2012, Overflow confirmed that Shiny Days, a remake of Summer Days, will be the last title produced by the brand. 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.

Overflow'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.


Overflow produced such games as:

  • November 26, 1999: Large PONPON (らーじ・PONPON, Rāji Ponpon)
  • August 25, 2000: PureMail
  • April 27, 2001: 0verflow Pleasure Box (オーバーフローぷれじゃ~ボックス, Ōbāfurō Purejā Bokkusu)
  • December 28, 2001: Snow Radish Vacation (Snowラディッシュバケーション, Sunō Radisshu Bakēshon)
  • December 27, 2002: Let's go for the little sister! (妹で行こう!, Imōto de Ikō!)
  • August 13, 2003: Summer Radish Vacation!! (Summerラディッシュバケーション, Samā Radisshu Bakēshon!!)
  • December 27, 2003: Magical Unity (マジカル☆ユニティー, Majikaru Yunitī)
  • April 30, 2004: MISS EACH OTHER
  • October 15, 2004: LOST M
  • April 28, 2005: School Days (スクールデイズ, Sukūru Deizu)
  • January 27, 2006: 0verflow Premium Trilogy Box (オーバーフロープレミアムトリロジーボックス, Ōbāfurō Puremiamu Torirojī Bokkusu)
  • June 23, 2006: Summer Days (サマーデイズ, Samā Deizu)
  • March 19, 2010: Cross Days (クロスデイズ, Kurosu Deizu)
  • October 8, 2010: School Days HQ (スクールデイズ ハイクオリティ, Sukūru Deizu Hai Kuoritī)
  • April 27, 2012: Shiny Days (シャイニーデイズ, Shainī Deizu)
  • TearMail (unreleased)
  • Island Days (Spring 2014)
  • References

    0verflow Wikipedia