If you are looking for or instrumental versions, some creators provide downloads for these specifically, such as this Trumpet Sheet Music available on YouTube.
: Season 2, Opening 1 (technically the 3rd opening of the series).
The 3rd opening theme for Ansatsu Kyoushitsu (Assassination Classroom) is titled , performed by 3-nen E-gumi Utatan (a group consisting of the main voice actors).
While direct MP3 download links are often unreliable or legally questionable, you can find high-quality versions of the song through the following official or community platforms: 🎧 Where to Stream and Listen