LIP CREAM's final album, “-SIN-”. Originally released without a title, commonly referred to as “The Last Album”, features an unconventional structure where audio skit and songs alternate, created with an extremely serious concept that sets it apart from all previous releases.

The production of “-SIN-” was also entirely based on Minoru's concept like with the “CLOSE TO THE EDGE”. However, the audio drama segment included in the original release was proposed by Minoru to the members in a rehearsal studio, where he shared his ideas. Upon hearing the apocalyptic themes, Pill volunteered to write the script himself. At this time, tensions between Minoru and Pill over the band's direction, coupled with Pill's negative vibes toward the members' preferences, reached a boiling point. This stress manifested itself during their touring, pushing the emotions of the other members and staff to the brink, severely impacting the band's ability to continue, ultimately leading to break up - the worst possible outcome.