[3] After graduating from high school, Endō moved to Tokyo to become a voice actress.
She enrolled in the Performing Arts Center, the training school of her current agency led by Nachi Nozawa, and graduated after repeating a year.
[6] She said that the reason she decided to go to the training school was because her parents knew Nozawa and thought he would be a safe option.
Her first regular TV anime role was as Kasumi Horiguchi in Oku-sama wa Joshi Kōsei in 2005, and since gaining recognition as Miyuki Takara in Lucky Star in 2007, she has played Sheryl Nome in Macross Frontier and Angelique in Neo Angelique in 2008.
Sailor Fuku, the opening theme song for the TV animation Lucky Star, and in 2008, she won the Best Singing award at the 2nd Seiyu Awards together with Aya Hirano, Emiri Katō and Kaori Fukuhara.