Other songs titled "Saihate" by artists like Minori Suzuki or SennaRin are also available.
鈴木みのり (Minori Suzuki) - サイハテ (Saihate) (Romanized)
You can find the full, legal download options and official audio for "Saihate" by APOGEE (released November 9, 2022) at these links: Amazon Music Apple Music Friendship YouTube