Two tracks. That is the entire soundtrack. Kounagihishouka is a 2006 PS2 visual novel and the OST is just "Konagihishoka" and "Happy Birthday." The title track carries the weight of the whole game on its back, setting whatever mood this story needed all by itself.
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"Happy Birthday" is presumably the emotional payoff, a single bright moment against whatever the main theme establishes. With only two songs, there is nowhere to hide. Every note has to count and every silence has to mean something.
PS2-era minimalism taken to its logical extreme. If you have four minutes and want to hear a complete emotional arc told in two tracks, here you go.