 After three-year, Morimoto moved to Verdy Junior Youth in 2001, and remained until 2004, when he was sold to Tokyo Verdy.On 13 March 2004, Morimoto made his J1 League debut for Tokyo Verdy against Júbilo Iwata at the age of 15 years, 10 months and 6 days, a league record for youngest player to debut.He scored his first goal against JEF United Ichihara on 5 May of the same year, two days before his 16th birthday, another league record for youngest goal scorer.