Playful orchestral bits mixed with tension cues and cozy slice-of-life warmth. Gensou Mangekyou is a Touhou fan animation series, and this soundtrack for the Giant Youkai Legend chapter leans hard into that mix of comedy and mystery.
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"居眠り紅茶館" (Dozing Tea House) is pure relaxation. "突撃・間欠泉!" (Charge! Geyser!) flips into action mode without warning. And the track labeled "⑨" is, yes, exactly the Cirno reference you think it is. The full versions of the OP and ED round things out nicely.
Everything has that fan-project sincerity where you can tell the composer genuinely loves this world. If you watch Touhou fan animations and wish you could just loop the background music, here it is.