The game's storyline is followed with two sequels, titled Yaneura no Lagoon (屋根裏のラグーン "Lagoon's Attic") and Irori no Lagoon (囲炉裏のラグーン "Lagoon's Hearth"), known as Lagoon Lounge 2 and Lagoon Lounge 3, respectively. The game and all of its sequels are complete. The series are originally written in Japanese, and has been translated in English. Both the Japanese and English version of the series have been released, and are available in Windows 2000/XP/Vista/7. App Locale will still be required for gameplay, though.
The story: All three games in the series have the story narrated from the perspective of the protagonist, Kuugo, a dark-furred Japanese Shiba Inu who reunites with an old friend after losing his job and starts working at a small town cafe dubbed The Lagoon Lounge, while also running into mischievous acts. Business has been good lately due to an increase in tourism people are coming to experience the mysterious phenomenon known as "The Giant of Harusu." But then, other strange things start to occur, and Kuugo begins to wonder if something sinister is behind it, while solving the mystery of 'The Poisonous Fountain'.
The story captures many aspects of Japanese slice-of-life stories. The plot itself revolves around the day-to-day internal operations of the Lounge and its employee's relationships with one another. There is also an unchecked fascination with a mysterious fountain in the middle of town which appears to have some connection to the rampant earthquakes which have been occurring sporadically, dubbed "The Giant of Harusu."
The gameplay is relatively short, ranging around 2 to 10 hours.
This game provides examples of:
- Adorkable: Kuugo and Seiya.
- Author Appeal: Muscles. Lots of them.
- Bara Genre/Yaoi Genre: With Yamato.
- Bittersweet Ending: Downplayed but it just makes it bad for the one that was close to you the whole time... except Yamato. In Irori, he leaves the village in his ending.
- Cast Full of Gay/Everyone Is Gay: If the reader makes the right choices, there will be a gay relationship involving Kuugo.
- Cast of Snowflakes: Kuugo is a dark-furred Shiba Inu, while Sousuke and Seiya is a Snow Wolf, and Gou is probably a Siberian Tiger.
- Homoerotic Subtext: Sometimes, it is a yaoi game after all.
- Hot Springs Episode: In the third game during the winter Yuujiro received tickets to a hot spring from a mall lottery. All five of the potential love interests went.
- Invisible Parents: Sousuke and Seiya's parents and aunt, Yuujirou's parents, and Gou's dad. Sousuke and Seiya's parents and aunt are dead.
- Love Dodecahedron: Let's see... Kuugo loves Sousuke, who loves Gou, who loves Sousuke back but not sexually while also taking sexual favors from Kuugo, who's also in love with Rai, who loves Kuugo back, who also loved Yuujirou for a short while, who loved Yuuri, who loved Sousuke, who loved her back because of a wish but was eventually revealed to love Kuugo. And yes, all of this is canon according to the sequels.
- Love Triangle: Sousuke, Yuuri, and Yuujirou in Himitsuri. Also Kuugo, Sousuke, and Rai in Irori.
- Keet: Seiya.
- Kemono: Every character in the game.
- Manly Bi: Yuujirou.
- Multiple Endings: There are a total of 7 different endings in Irori. There are Sousuke's, Rai's, Yuujirou's, Gou's, Yamato's, Seiya's, and Undecided Route.
- Porn with Plot: Only shows if the right option is taken.
- Put on a Bus: Seiya in Yaneura. He makes a return in Irori, though.
- Real Place Background: Hallstatt, Upper Austria, Salzkammergut, and the nearby Hallstätter See, located in Austria.
- Red Oni, Blue Oni: Sousuke and Gou.
- Romantic Comedy: The game has lots on some paths.
- Sempai/Kohai: Yuujiou and Yuuri as the Kohai, while the rest are his Senpais, mostly Kuugo.
- She Who Must Not Be Seen: Subverted with the Yuuri's revelation, who is a girl. Also applies to those who are mentioned within the story.
- Ship Tease: The fans likes to tease some the main group.
- Slice of Life
- Straight Gay/Manly Gay: Sousuke.
- Unresolved Sexual Tension: For some of the guys, if Kuugo persude their paths.
- Victorious Childhood Friend: If you hook up with Sousuke.
- Your Cheating Heart: Occurs in Yaneura when Sousuke finally finds about Kuugo hiding Rai, but they mend their relationship later.