21-year-old singer-songwriter Leina, who made her major debut in September 2025, whose lead track "One Week" received power play on 40 stations nationwide, and whose "medicine" released in April 2025 surpassed 200 million total plays on TikTok, takes on her first anime theme song! Ending theme for the TV anime "Nihon Sangoku" airing from April. The included Blu-ray contains the non-credit ending video for the TV anime "Nihon Sangoku."