_Summer (アンダーバーサマー, Andābā Samā), also known as Underbar Summer, is a Japanese adult visual novel developed by Hooksoft which was released on July 15, 2005, playable on Windows as a CD; a PlayStation 2 consumer console port called _Summer## followed on August 24, 2006, by GN Software.

An updated version of the original game, called _Summer Renewal Edition (_Summer新装版, _Summer Shinsōban), which is compatible up to Windows Vista as a DVD, was released on December 21, 2007.

The gameplay in _Summer follows a plot line which offers pre-determined scenarios with courses of interaction, and focuses on the appeal of the six female main characters.

_Summer has made several transitions into other media, such as a mini four-panel web comic, a manga one-shot published in Kadokawa Shoten's Comp Ace magazine, and four character light novels written by Jōji Kamio.

[1] There are six main potential love interests presented to Takumi in _Summer; they are Konami Hatano, Shino Ebizuka, Sana Kaizu, Chiwa Amano, Wakana Shimazu, and Hinako Nanao.

[6] An upperclassman called Wakana has an immense crush on Takumi, despite her popularity with boys due to her beauty and elegant personality.

[1] Takumi slowly starts to take a romantic interest in the girls around him, while his friend Osamu relentlessly searches for a girlfriend as well.

[16] _Summer is self-described as a "laid-back school romance love comedy adventure game" (まったり純恋学園ラブコメADV, Mattari Jun Koi Gakuen Rabu Kome ADV), according to Hooksoft.

[18] A version for the PlayStation 2 with adult content removed, called _Summer## (アンダーバーサマー ダブルシャープ, Andābā Samā Daburu Shāpu, read as Underbar Summer Double Sharp), was developed by GN Software and released in Japan on August 24, 2006, in limited and regular editions.

[23] An updated version of the original game, called _Summer Renewal Edition (_Summer新装版, _Summer Shinsōban), which is compatible up to Windows Vista as a DVD, was released on December 21, 2007.

[25] These and Like Life's comic strips were later published in the MTG corner of Enterbrain's Tech Gian magazine.

[33] The book consists of 135 pages and contains a character and story introduction, an illustration gallery, voice actor and staff interviews, strategy guides, and more.

[34] _Summer's opening theme from the game is "Love Song" (こいのうた, Koi no Uta) sung by Miyuki Hashimoto,[35] and the ending theme from the game is "Important Person" (たいせつなひと, Taisetsu na Hito) by YuNa; "Important Person" was also used as an insert song.

[35] In July 2005, Messe Sanoh released a retailer bonus CD titled _Summer Original Arrange SoundTracks.

[44] The limited editions were released on UMD (Universal Media Disc), and include illustrations by the staff of Hooksoft.

[37] A character from Like Life named Keshiko makes a small cameo appearance as the blackboard eraser in both episodes,[45][46] though she is left unnamed in the OVA series.

[48][49] Character goods such as phone danglers, an underlay, a clear file, a mouse pad, and fastener accessories were all produced by Exhaust, and sold at Comiket.

[27] The bag contained a CD folder, a mini-clock depicting two characters from Like Life, Okiru and Keshiko (the latter had a cameo appearance in the _Summer OVA series),[45][46] a mini lantern imitating the lanterns from the fictional shrine in _Summer, a cold bottle cover, a booklet-type post card set, a sticker set, a bookmark, a drawn underlay, a telephone card, and lastly, a drama CD.

[26] The disc includes a collection of wallpapers, screen savers, and opening movies for both _Summer and Like Life, as well as unpublished voice actor interviews.

[51] According to a national sales ranking of bishōjo games sold in Japan, the PC release of _Summer premiered at No.

[56] _Summer did however beat visual novels such as Happiness!, Tick Tack!, Tomoyo After: It's a Wonderful Life, and School Days in sales that year.

[58] As a prize for gathering the most votes, a downloadable wallpaper featuring Konami was made available on the website in various resolutions.