Matsumoto graduated from the Department of Political Science, Faculty of Law, Chuo University after graduating from Yakuendai High School. He used to be a member of Production Baobab. He was also the vice-chairman of Sugoroku, a theater company led by Kenichi Ogata, and became the chairperson after Ogata retired. He later left the company in 2016.[3]
When Matsumoto was a student, he was the captain of a cycle racing club, and has even participated in the National Athletic Meet. However, he left the club due to a back injury. Originally a science fiction enthusiast, he was a science major until he was in high school. However, after watching a political program on TV at some point, he became interested in the world's developments and entered the Department of Political Science in the Faculty of Law at Chuo University with the intention of becoming a bureaucrat.[4][5] Although he hoped to pursue a career related to politics, he was faced with a harsh reality and spent his school days lost in his career path.
In the midst of all this, Matsumoto was impressed by the movie The Sound of Music, and since all of his friends at the boarding house were film buffs, he decided to become a film production staff member. However, when he graduated from university, the Japanese film industry was in a state of downsizing and there were not many good opportunities for staff, and unlike today, there were few production companies, so the road to film production was difficult. He decided to join a theatrical troupe, hoping to become staff after getting into the world of actors first. When he was about to graduate, a friend of his introduced him to Theater Company Garakuta Kōbō (now Sugoroku), which was recruiting, and he entered the affiliated training school as a fourth-year student.[5]
Although he did not have much experience in voice work, when he went to observe a studio that was recording the voice actors' dubbing, he was surprised to see how all the cast members at the scene watched the footage only once on the spot and recorded it immediately, although nowadays actors receive rehearsal materials in advance. When he borrowed the script and watched the performance, his eyes could not keep up with the speed of the performers' work, and he couldn't follow where they were at.[5] After that, he had several auditions for voice work, but had no idea what work he was auditioning for. In the midst of that, he was told to read a manuscript according to the feeling of an artwork he was shown, and when he did, he passed his first audition. That was to be his debut work, the anime TV series Manga Nihon Keizai Nyūmon.
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Abunai Series 2: Abunai Summer Vacation – Yoshiaki Sawatari