KOTOKO and Rita on the same tracklist is already a win. Tsuyokiss 3 Gakki's full edition soundtrack brings that late-era Windows VN energy with vocal tracks that absolutely carry the album. "☆虹色ロックンロール♪" by Shimotsuki Kaori opens with bright, punchy rock-pop that sets the whole mood, while KOTOKO's "Love mission!!"
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does what KOTOKO always does and makes it sound effortless. The BGM side is solid too. "決戦" brings real tension and "静かな夜" is exactly as gentle as the name promises. All four vocal tracks get instrumental versions, which is great for looping.
If you follow KOTOKO or Rita at all, you already know you need to hear this.