_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] Over the years, he has made good memories with these friends of his, most of whom are girls, though apparently still have no overt feelings of attraction towards any of them.

[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.

[7] The homeroom teacher of Takumi, named Hinako, will often be seen trying to find free food because of her money wasting.

[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.

[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.