Oishi Masayoshi is tied to three 2026 anime and event music roles: the opening theme for Hanaori-san wa Tensei shite mo Kenka ga Shitai, a performance at the Azur Lane 9th anniversary music event, and a co-starring role in Ace of Diamond act II -Second Season- alongside Snow Man's Daisuke Sakuma.
Oishi Masayoshi's 2026 slate runs across theme songs, a franchise concert, and, for the first time in the stories here, a voice role. In June he was confirmed as the performer of the opening theme for Hanaori-san wa Tensei shite mo Kenka ga Shitai, the summer romantic comedy that premieres July 11 on the ANiMAZiNG!!! block. The same announcement paired him with Maaya Uchida, who voices Tsumugina Meru and sings the ending theme, completing the show's music lineup ahead of its premiere.
Days earlier, Azur Lane named him among the performers for AZUR LANE MUSI9 FES., the 9th anniversary event set for September 5-6, 2026, at Shinjuku Sumitomo Building Triangle Square and Shinjuku Sumitomo Hall. The event centers on a live concert, with May'n among the other performers, and ticket prices listed at 3,000 yen for regular admission and 12,000 yen for premium access.
In September, Oishi joined the cast of Ace of Diamond act II -Second Season-, which airs in October, alongside Snow Man's Daisuke Sakuma, who voices Shinichiro Saotome. Oishi said on X that his dream came true, referring back to a March post in which he wished to work on the same anime as Sakuma. The three stories show a year spent mostly on music, with the Ace of Diamond role adding a cast credit to the theme-song and concert work.
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Masayoshi Oishi and Snow Man's Daisuke Sakuma will co-star in the TV anime Ace of Diamond act II -Second Season-, airing in October. Oishi shared on X that his dream came true, recalling his March post wishing to work on the same anime as Sakuma. Sakuma voices Shinichiro Saotome.
Maaya Uchida will voice the mysterious girl Tsumugina Meru in the TV anime Hanaori-san wa Tensei shite mo Kenka ga Shitai. The second promotional video also reveals Masayoshi Oishi performs the opening theme, while Uchida sings the ending. The anime premieres July 11 on the ANiMAZiNG!!! block.
Azur Lane announced the "AZUR LANE MUSI9 FES." event for September 5-6, 2026, at Shinjuku Sumitomo Building Triangle Square and Shinjuku Sumitomo Hall. The 9th anniversary celebration emphasizes sound, featuring a live concert with performers including May'n, Masayoshi Oishi, and others. Tickets are 3,000 yen for regular admission and 12,000 yen for premium access.