Lisa, also called Lisa’s Theme, is a musical theme associated with the character Lisa. Originally, this track was a part of Doki Doki Literature Club! New Heading soundtrack, and later it was remixed for Bombs vs. Sleepwalkers game series, since the titular character Lisa is a crossover character.
This track is a part of Bombs vs. Sleepwalkers Medley.
Listen
In Medley Part 1, Lisa starts playing at 2:09.
Other versions of Lisa
You can find the original version and various other versions in the soundtrack of Doki Doki Literature Club! New Heading.