Nachu was a member of SDN48's 1st Generation. She is now affiliated with Watanabe Pro.
- Real Name: Takekawa Natsuko (竹川奈津子)
- Likes: PapaPara, TekuPara, TeraPara, blog, Gyarusa, tanning salon
- Loves: Variety
- Special skills: Assemble Gyarus, nail art
- She is a specialist in MC.
- She can dance 300 Para Para songs.
- She is the only SDN48 member (excluding AKB48 to SDN48 Transferred Members) to participate in an AKB48 single, as well as the first one to appear in their TV shows.
- She also participated in the SDN48 2nd Generation shows.
- She does calligraphy (shodo) as paper art and body art.
- SDN48 1st Generation → Graduation
- Joined SDN48 as a 1st Generation Understudy on August, 2009
- Promoted from Understudy on May 15, 2010
- Graduated on March 31, 2012
Solo Live Shows
- Nachu LIVE ~Shotai HACHI Ooyake Fan no Tsudoi~ (2010)