Story Mode: Onward! is a very short jingle, lasting roughly five seconds, taking a lot of elements from Turquoise October songs. It is the signature five-note melody of the Octarians playing twice, the second time with a higher pitch. Shortly after, a radio static sound effect is heard on the iris-out shot of the Zapfish or a plush of it, although said sound effect is absent from the Splatune version. It is heard during the sequence that plays once the player finishes a mission in Octo Valley.
Remixes and covers
Story Mode: Onward! (Octo Canyon)
A remix of the jingle appears in Splatoon 2. Unlike the original, which has no artist given, the Splatune 2 booklet lists it as a Turquoise October song. Similar to the original, it plays after successfully completing a mission in Octo Canyon.
Mission Complete! (The Crater)
A remix of Story Mode: Onward! plays in Splatoon 3's single-player campaign Return of the Mammalians after completing one of the four missions in the Crater. However, it is replaced by a different jingle in Alterna.
The intro of Eight-Legged Advance is a version of the Story Mode: Onward! jingle. The "burp" sound effects have a great similarity to the sounds in Story Mode: Onward!
Similar to DJ Octavio's usage of the jingle, the demo version of Ebb & Flow contains interpolations of the Story Mode: Onward! theme, alluding to Marina's Octarian origins.
The Story Mode: Onward! jingle can be heard twice in the Inkopolis Memorial Mixtape. The first time, the same version of the jingle heard in Eight-Legged Advance plays, and the second, which seems to be the same choral version that plays in I Am Octavio, is heard after the Opening jingle by Wet Floor.