Three Sisters' Story (Visual Novel Soundtrack, 1996)

Some more old eroge soundtrack. 1996, JAST, relased in 1996 by JAST USA for North America, also part of the JAST USA Memorial Pack (2002). Devs: Sakura Soft

Again shenanigans in the game files, tracks are named 'Sis01' to 'Sis22', with 'Sis17' and 'Sis19' missing. :3

You can find the game here: https://www.myabandonware.com/game/three-sisters-story-bxi