Calli x Rikka (Morikka) - Spiral Tones

Rikka and Calli singing their Original song, Spiral Tones on RiTunes Labo. I highly recommend also watching the debut of their song on Rikka's "Over the Silver Dawn" singing stream (link below), and be sure to look out for the MV coming out sometime in April. RiTunes Labo Stream (source):    • #15【RiTunes Labo】生セッション歌枠：ゲスト『Mori Calliop...   Rikka's "Over the Silver Dawn" stream:    • 【#律可10万人記念ライブ】Over the silver dawn【律可/ホロスターズ】   Calli's Channel:    / @moricalliope