The official YouTube channel for Japanese singer Mayu Maeshima started streaming a music video for her latest eighth digital single song "melting days," which is featured as an insert song for the fall 2025 TV anime Isekai Quartet3 . Mayu Maeshima "melting days" Music Video Isekai Quartet is a crossover series featuring characters from various isekai anime series, and Maeshima has provided theme songs for some series featured, such as Re:ZERO -Starting Life in Another World- , Overlord , and The Eminence in Shadow . Maeshima shared her thoughts on the song on her official X (formerly Twitter) account : "'melting days' It has become an even more important song to me. Life is full of loss, repeating despair and farewells, but the people, things, and moments I encountered along the way will always remain within me… Such a bittersweet yet gentle, cold yet warm song — truly like snow." "Melting days" released digitally on November 25. To commemorate the release, Maeshima plans a special live-stream on her official YouTube channel , starting at 20:00 JST, 03:00 PT on November 26. "melting days" digital jacket Mayu Maeshima artist photo RELATED: Isekai Quartet3 Anime Shares Ending Song Lyric Video Isekai Quartet3 Trailer Following Season 1 in 2019 and Season 2 in 2020, Isekai Quartet3 premiered in Japan on October 13, 2025. Crunchyroll streams the latest season for members in North America, Central America, South America, Europe, Africa, Oceania, the Middle East and CIS. Crunchyroll describes the series as such: The button appeared out of nowhere. There weren’t any signs NOT to push it…so the solution is obvious, right? Is it a trap or the start of something new and exciting? The crews of Re:Zero, Overlord, Konosuba, and The Saga of Tanya the Evil will find out when they go from their world to another and get stuck in…class?! See what adorable chaos they’ll get up to in this collection of shorts! Source: Mayu Maeshima official YouTube channel
