Yōsuke Masaike (政池 洋佑, まさいけ ようすけ), born July 25/26, 1983, is a celebrated Japanese screenwriter and drama structuring writer. Initially employed at USEN, he left to pursue writing, studying under notable figures like Arisa Kaneko and Takeru Ishihara .
Masaike has a versatile writing portfolio spanning TV dramas, films, and adaptations. His notable TV credits include high-profile manga adaptations such as Miss Sherlock and Shiyakusho, human-interest stories like Rental Nanmo Shinai Hito, and mainstream dramas like Anonymous: Keishicho “Yubisatsujin” Taisakushitsu. On the big screen, he wrote the screenplay for the manga‑adapted Million Joe and the live‑action THE 3名様Ω revival .
His writing style is marked by carefully crafted settings, deep character development via probing questions, tightly plotted three-act structures, and strong forward momentum that engages audiences episodically . As a manga adaptation specialist, he focuses on preserving the essence of the original, crafting scripts that honor the tone and emotional core of the source material .
Masaike earned critical acclaim for his work on Haken Anime!, garnering the 2023 Japan Academy Prize for Best Screenplay—a testament to his talent in transforming written narratives into compelling screen experiences.