Koibana Onsen by Kawatsu Kenjiro — Completed
- Volume 1
- Chapter 5: Koibana's Source released Feb 5 '09
- Chapter 6: I Love My Big Brother! released Mar 11 '09
- Chapter 7: The Internet Addict released Apr 10 '09
- Extra: Cheer! released Apr 17 '09
- Volume 2
- Chapter 8: First Time In Charge While Everyone's Out released May 2 '09
- Chapter 9: Look-a-Like Honey released May 13 '09
- Chapter 10: First Experience at Koibana Onsen released Jun 26 '09
- Chapter 11: Because we're connected... Even though we're connected... released Jul 20 '09
- Chapter 12: Christmas Matchmaking Bash released Aug 14 '09
- Chapter 13: Nonoka Catches a Cold released Sep 7 '09
- Chapter 14: Moeka's Valentine Operation released Sep 21 '09
- Extra: Koibana Onsen ~collecting data to chronicle~ released Nov 21 '09
- Volume 3
- Chapter 15: Befriending a Newcomer (Part One) released Dec 21 '09
- Chapter 16: Befriending a Newcomer (Part Two) released Aug 24 '10
- Chapter 17: Befriending a Newcomer (Part Three) released Aug 27 '10
- Chapter 18: Rurika's Teardrops released Sep 1 '10 Foiled rape attempt
- Chapter 19: Memories at Sea released Sep 3 '10
- Chapter 20: Rurika: Summer 2006 released Sep 6 '10
- Chapter 21: Rurika is Just as Brave! released Sep 11 '10
- Volume 4
- Chapter 22: Throbbing, Pounding released Sep 26 '10
- Chapter 23: You're Not a Girl? released Oct 9 '10
- Chapter 24: Nonoka's Christmas Present ♥ released Oct 11 '10
- Chapter 25: A Relaxing Study Session released Oct 15 '10
- Chapter 26: Onee-chan, Working Hard! released Oct 26 '10
- Chapter 27: You Can Do It! released Oct 30 '10
- Chapter 28: A Cherry Blossom Drive released Dec 14 '10
- Chapter 28.5: Koibana Onsen, Maid Style! released Dec 14 '10
- Volume 5
- Chapter 29: Senpai and Senpai released Dec 14 '10
- Chapter 30: Kouhai and Kouhai released Dec 26 '10
- Chapter 31: Secret Hot Spring! Open Air-Bath!! (Part One) released Jan 16 '11
- Chapter 32: Secret Hot Spring! Open Air-Bath!! (Part Two) released Jan 16 '11
- Chapter 33: Secret Onsen Date released Jan 17 '11
- Chapter 34: Our Customers are Foreigners! released Jan 17 '11
- Extra 1: The World's Most Incompatible Couple!? released Jan 22 '11
- Extra 2: Scouting!? A Love Hotel! released Feb 11 '11
- Volume 6
- Chapter 35: Fuuka's Love Story (Part One) released Feb 26 '11
- Chapter 36: Fuuka's Love Story (Part Two) released Feb 27 '11
- Chapter 37: Fuuka's Love Story (Part Three) released Mar 4 '11
- Chapter 38: Fuuka's Love Story (Part Four) released Mar 13 '11
- Chapter 39: Onsen Prince (Part One) released Mar 13 '11
- Chapter 40: Onsen Prince (Part Two) released Apr 23 '11
- Extra 1: Getting Prettier Through XXX! released May 10 '11 Masturbation
- Extra 2: An Incan Awakening! released May 10 '11
- Volume 7
- Chapter 41: In The Kitchen! released May 28 '11
- Chapter 42: Get Bigger! released May 28 '11
- Chapter 43: Koibana Onsen, On Reservation! released Jul 21 '11
- Chapter 44: The Two of Us, From Now On released Jul 30 '11
- Chapter 45: The Couple with an Age Difference released Sep 25 '11 Student x Teacher
- Chapter 46: A Girl's Couple released Sep 25 '11 Yuri
- Chapter 47: Hakusen University Student Festival released Sep 25 '11 Cross-dressing
- Chapter 48: Double Date released Sep 25 '11
- Volume 8
- Chapter 49: Their Coming-of-Age released Oct 15 '11
- Chapter 50: The Two of Us, On the Kotatsu released Oct 18 '11
- Chapter 51: Gin-chan, from the Liquor Store released Oct 18 '11
- Chapter 52: A Fake Couple released Oct 22 '11
- Chapter 53: Indecent Feelings...!? released Oct 29 '11
- Chapter 54: A Small Wedding in June released Nov 11 '11
- Chapter 55: The Determination of a Year released Nov 12 '11
- Chapter 56: Where There's Pain, There's... released Nov 12 '11
- Volume 9
- Chapter 57: Wow! Wow! Wow! released Dec 3 '11
- Chapter 58: It's Too Hard to Do It released Dec 29 '11
- Chapter 59: Just for practice! released Jan 15 '12
- Chapter 60: A Christmas for Adults released Jan 15 '12
- Chapter 61: Babysitter Nonoka released Jan 16 '12
- Chapter 62: An Impatient Valentine released Jan 16 '12
- Chapter 63: Koibana Onsen 63 released Feb 4 '12
- Chapter 64: Koibana Onsen 64 (end) released Feb 4 '12