"Guilty Love" is a 2026 Gavinners hit single. It was also one of their last, due to the disbandment of the band after the fall of that year. When Klavier Gavin, the Gavinners' lead member, is prosecuting a case in court, he often has this song play in the background and even has it as his ringtone, as does Wesley Stickler. When a murder occurred during a Gavinners concert, Gavin had Apollo Justice play the song from an audio mixer to show that Daryan Crescend, the second guitar of the band, had made a mistake when playing it. This later proved useful to Justice in court when he revealed that Crescend had been the one to murder Interpol agent Romein LeTouse, with the gunshot audible during the performance of "The Guitar's Serenade".
- This song also plays during Phoenix Wright's trial in Turnabout Succession, even though it's not supposed to exist yet. However, since no one reacts to the song (as Apollo Justice did in Turnabout Corner), it could simply be considered as background music.
- "Klavier Gavin ~ Guilty Love" and "Surging Eyes" are the only themes that are carried over unchanged to Phoenix Wright: Ace Attorney: Dual Destinies, both being from the soundtrack of Apollo Justice: Ace Attorney. The rest of the soundtrack of Dual Destinies contains new tracks and new versions of old tracks. "Klavier Gavin ~ Guilty Love" again remains unchanged in Justice's non-canon downloadable episode in Phoenix Wright: Ace Attorney: Spirit of Justice.