- Hakuto Nagumo (南雲 白兎 Nagumo Hakuto?)
- Voiced by: Ryōko Tanaka
- Itsuki Nagumo (南雲 夷月 Nagumo Itsuki?)
- Voiced by: Aoi Kisaragi
- Rea Mikoshiba (御子柴 玲亜 Mikoshiba Rea?)
- Voiced by: Kana Fumiduki
- Rio Mikoshiba (御子柴 莉織 Mikoshiba Rio?)
- Voiced by: Suzune Kusunoki
- Chimari Komamiya (駒宮 ちまり Komamiya Chimari?)
- Voiced by: Mahiru Kaneda
- Madoka Sakaki (榊 円華 Sakaki Madoka?)
- Voiced by: "Yuki"
- Kenji Sakaki (榊 賢治 Sakaki Kenji?)
- Voiced by: Tsukasa Madera
- Yūki Hayama (葉山 雄基 Hayama Yūki?)
- Rin Asuka (飛鳥 凛 Asuka Rin?)
- Kuon Nogisaka (乃木坂 久遠 Nogisaka Kuon?)
- Robert Ichimonji (ロベルト＝イチモンジ?)
- Voiced by: Ayumu Nakazawa
- Saionji-sensei (西園寺 先生?)
- Airi Momose (桃瀬 愛理 Momose Airi?)
- The PS2 exclusive character.
Voiced by: Mia Naruse
Clover Heart's was first released for PC on four CDs in November 28, 2003. On June 25, 2004 a DVD edition of the game was released.
The game was ported to the PlayStation 2 as Clover Heart's: Looking for Happiness. The PS2 version has the pornographic elements removed, but features the new character Airi Momose. Looking for Happiness was released in three versions: a limited edition, standard edition, and Best version (budget release). The limited edition came with a bonus drama CD.
Another port for FOMA mobile phones was released on December 28, 2004.
Lastly, it was ported as a DVD TV game in January 26, 2006.
- (Japanese) Page for the original version
- (Japanese) Page for the DVD version
- (Japanese) Page for Clover Heart's: Looking for Happiness
- (English) English review of the game
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