Premise: Matsuri Mizuguchi (水口 まつり , Mizuguchi Matsuri , born October 28, 1986 in Yamagata Prefecture) is a Japanese voice actress who started her career in 2007. She is affiliated with Yellowtail. This voice actress shares the same exact date of birth and age as another unrelated Japanese voice actress and singer, Aki Toyosaki.
Hypothesis:  Matsuri Mizuguchi started voice acting in 2006