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IndustryInteractive entertainment
Brand novelties
GenreErotica; Eroge
FounderAkio Ōnuma
Kanda, Chiyoda , Tokyo
Area served
Key people
Akio Ōnuma (CEO)
Kimihiko Iwasaki (Director)[1]
ProductsSchool Days
Summer Days
Cross Days
Number of employees
ParentStack Ltd.

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.[2] The Overflow label is known for its game franchise School Days.[2] The company headquarters are located in the Sugishō Building (杉商ビル, Sugishō Biru) 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 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.


Overflow produced such games as:[4]

  • 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)[5]
  • 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)[6]
  • July 3, 2014: Island Days (アイランドデイズ, Airando Deizu)
  • TearMail (cancelled)
  • April 28, 2016: Strip Battle Days 2 (ストリップバトルデイズ2, Sutorippu Batoru Deizu 2)


  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. ^ http://www.crunchyroll.com/anime-news/2012/02/11-1/school-days-creators-0verflow-announces-shiny-days-will-be-final-game
  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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