Mamoru Ando instructs acting at the Kouka School of Musical and Theatrical Arts, training students such as Sarasa Watanabe and her classmates. He bears the moniker "The Phantom," originating from his celebrated performance as the lead in *The Phantom of the Opera* during his stage career.

His background features a successful run as a popular musical actor until an onstage accident ended his performing days, prompting a shift into teaching. Early in this role, he struggled with effective instruction, emphasizing theoretical aspects of the Stanislavsky System without permitting practical application, which diminished his teaching impact.

During student auditions for a *Romeo and Juliet* skit, he personally portrayed Mercutio. His intense delivery overpowered the students, derailing their performances and revealing his misalignment with educational needs. Critiques noted his focus on replicating past performances technically rather than cultivating originality, exemplified in his feedback to Sarasa Watanabe about her imitative approach.

His personal ties link to the wider theater sphere through Sarasa Watanabe's family, which maintains connections to kabuki traditions.