An adult PC game by Hook, released in July 2005. A non-adult version for the PS2 was released by GN Software in 2006.　The game was adapted into light novels, drama CDs, and an OVA.

External links

• Official site (PC): http://www.hook-net.jp/_summer/
• Official site (PS2): http://www.goodnavigate.com/GN/products/_summer/index.html (Dead link)
• Official site (Anime): http://anime.softgarage.com/_summer/
• Official site (Drama CD series): http://www.marine-e.co.jp/sakuhin/_summer/
• Wikipedia: Underbar Summer
• VNDB: Underbar Summer

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