”The Legendary Hero is dead ” Opening "Shinda!" OUT He started his career in 2014 under his katakana name オーイシマサヨシ(Oishi Masayoshi), and as an artist, he has sung the theme songs for popular anime such as "Ace of Diamond", "Monthly Girls' Nozaki-kun" and " Tada Never Falls in Lovet", " Cop Craft" ", "DYNAZENON", "Love After World Domination" as well as the SFX drama "Ultraman R / B (Lube)". He wrote and arranged the opening theme song "Welcome to Japari Park" for the TV anime "Kemono Friends" in 2017, which was a big hit, and also active as the digital rock unit "OxT", and his music video for "Clattanoia", the theme song of the TV anime "Overlord", has over 10 million views on YouTube. GRIDMAN", the theme song "UNION" reached number one on many music distribution services including iTunes.