てんとうむChu! (Tentoumu Chu!) is an unit composed by AKB48, SKE48, NMB48 and HKT48 members. Their first original song was 君だけにChu!Chu!Chu! (Kimi Dake ni Chu! Chu! Chu!). The song was later included on AKB48 33th single, ハート・エレキ (Heart Ereki). The unit was announced at the Sapporo Dome concert of the AKB48 5 Big Dome Concert Tour. At the time of the announcement, all seven members were Kenkyuusei. It was speculated that