Swords-as-girls mobile game, but the soundtrack goes legitimately hard with traditional Japanese instrumentation layered over modern orchestral production. Tenkahyakken -Zan-'s 2017 OST covers the full range from peaceful shrine life to all-out war across twenty-eight tracks.
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"巫剣との日々" (Days with the Shrine Swords) has this gentle koto-driven warmth, then "一触即発" (Hair Trigger) snaps into combat tension without any transition. "硝煙と砲火の舞踏会" (Ballroom of Gunsmoke and Cannon Fire) is the most dramatic track title on this list and the music matches it completely.
"相思相愛" (Mutual Love) and "神秘な、そして・・・" (Mysterious, and then...) wind things down with softness and ambiguity. If you played any of the sword-personification gacha games and wanted one with a score that actually commits to the Meiji-era aesthetic, this one goes all in.