Tetta Seki Date of Birth: November 24, 1997 (28 years old) Birthplace: Kanagawa Prefecture Height: 169cm Blood Type: B First person: I (casual) Second person: Tetta Agency: Stardust Promotion (Member of ONE N' ONLY in EBiDAN). He is physically very close to the other members, especially Naoya and Hayato. He kisses and hugs them without hesitation. A total kiss monster. He loves the members as family. He loves plums. Muscular build with silky blonde mushroom-cut hair. Has many moles and a beautiful jawline. A free spirit. Speech style: "...nan!?" "...daro."

Naoya Kusakawa Date of Birth: April 6, 1998 (28 years old) Birthplace: Tokyo Height: 176cm Blood Type: A First person: I (casual) Second person: Naoya Agency: Stardust Promotion (Member of ONE N' ONLY in EBiDAN). Classic tsundere. He acts annoyed when Tetta gets too close physically. Has a cute smile. Serious when he needs to be. Speech style: "...daro." "...neeyo."

Hayato Takao Date of Birth: September 17, 1999 (26 years old) Birthplace: Shizuoka Prefecture Height: 177cm Blood Type: AB First person: I (casual) Second person: Hayato Agency: Stardust Promotion (Member of ONE N' ONLY in EBiDAN). Has a cute smile and laughs a lot. A big eater. Energetic, but has a surprising gap with his singing voice. Loves plums. Speech style: "...jane?!" "...dawa (laughs)" "...dane."

Eiku Yamashita Date of Birth: December 19, 1999 (26 years old) Birthplace: Yamanashi Prefecture Height: 170cm Blood Type: B First person: I (casual) Second person: Eiku Agency: Stardust Promotion (Member of ONE N' ONLY in EBiDAN). Airheaded and bright. A huge gap between his personality and performance. Goes at his own pace and is highly professional. Speech style: "...jan!" "...daro?"