- Ayako Kawasumi(Ruriko Ikusawa in Gatekeepers)as Makoto Takenouchi
- Tomokazu Seki(Domon Kasshu,Touya Kinomoto) as Shin(Shoko's husband)
- Houko Kuwashima(Yurika Misamaru,Kirika Yuumura,Sango)as Shoko(Shin's Wife)
- Motoko Kumai(Li Shaoran in Card Captor Sakura) as Yo Takayama
- Yuuko Miyamura(Asuka Langley Souryu,Ayane Matsui) as Maki
- Kouichi Yamadera*(Ryouga Hibiki,Spike Spiegel,Ryouji Kaji)as Maki's father
- Mika Kanai*(Mei Mar in KO Seiki Beast)as Maki's mother
- Yumiko Kobayashi(Excel Kobayashi),Mikako Takahashi(Mikako Hyatt),and Tomoko Kawakami(Utena Tenjou,Rika Sasaki) as additional female student voices
- Hiromi Tsuru**(Ukyou,Ranma-kun's best fiancée)as Makoto's and Shoko's mother
- Kappei Yamaguchi(Ranma-kun,Inu-Yasha,Fancy Lala's Tarou Yoshida,and many other anime/game characters) as Makoto's and Shoko's father
- Toshihiko Seki*(Mousse,Duo Maxwell)as the homeroom teacher
- Kouji Tsujitani*(Hiroshi in Ranma ½,Miroku in Inu-Yasha)as the P.E. teacher
- Kenichi Suzumura(Kamui in X TV)as Ryuu
- Kentarou Itou(Jun Aoi in Kidou Senkan Nadeshiko)as Pon Ohata
- Megumi Hayashibara*(Ranma-chan,Rei Ayanami,Ongo,Faye Valentine,and others)as the hospital nurse
- Tetsuya Iwanaga(Kensuke Aida) and Kenji Nojima(Setsuna in Angel Sanctuary) as Ryuu's male friends
- Kikuko Inoue(Kasumi Tendou,Belldandy) as the shopkeeper
- Miki Itou(Sonomi Daidouji,Hokuto Sumeragi in Tokyo Babylon,Nova)as Ryuu's and Shin's mother
- Hideyuki Tanaka(Fujitaka Kinomoto)as Ryuu's and Shin's father
- Yuuji Ueda(Yoshio in Fancy Lala,Akito Tenkawa,and the true Japanese voice of Rurouni Kenshin's Sanosuke Sagara)the Bike Race announcer
- Issei Miyazaki*(Yamazaki-kun in CCS,Subaru Sumeragi in X/1999 the movie) and Shoutarou Morikubo*(Iwata in Excel Saga)as additional bikers
Notice how I used younger seiyuu(born in the 70's and 80's)for most of the characters and used the older seiyuu(born in the 50's and 60's)for the adult roles.I just had to cast Kappei-sama in a dignified role as a married parent(though it hasn't actually happened unless you count the future/fantasy sequences in the Ranma ½ anime)to guarantee his character a love interest voiced by a quality female seiyuu.Additionally,I had to assign Yo Takayama to an otokoyaku since he seems to be an antagonist.If you're not familiar with this manga,a nutshell summary can be found here.
**Owing to the "act of treason"(i.e.Hiromi Tsuru's previous marriage to another VA),I reserve the right to substitute who I'm pairing Kappei-sama with.The short list of alternates includes(but is not limited to):Wakana Yamazaki(Ran Mouri),Yumi Touma(Urd,Deedlit),Aya Hisakawa(Sailor Mercury,Yohko Mano,Kero-chan,Miki Kaoru,Tarta,and others),Chieko Honda(Chigako Ogawa,Kozue Kaoru),Ai Orikasa(Ryouko,Quatre),Minami Takayama(Nabiki Tendou,Ascot),Kumiko Nishihara(Shiori Takatsuki,Iris),Maya Okamoto(Haruka Minato,Orihime),Yuuko Mizutani(Mihoshi,Great Will of the Macrocosm),Ikue Ohtani(Pikachu),Kikuko Inoue(see above),Kotono Mitsuishi(Sailor Moon,Excel,Juri Arisugawa,and others),Yuriko Yamaguchi(unrelated to Kappei-sama,but voiced EVA's Ritsuko Akagi as well as Wonder Okayama in an episode of Fancy Lala),and Yuri Shiratori(Mokona,Arisu Sakaguchi in PSME,Nanami Kiryuu).If Kikuko-san is paired with Kappei-sama,Kotono-san would inherit Kikuko-san's original assigned role.