Hana ni Natte (Ryokuoushoku Shakai) TV anime “Kusuriya no Hitorigoto” OP song It is arranged in B Flat minor, which is the key of the original song. The same goes for performances and karaoke, which are sold separately by each company. The length of the song is also the same as the original.
Solo & Back Tracks:
https://music.youtube.com/watch?v=6xGVPmV0Ib0&list=OLAK5uy_k1cmrafgOtMjyRRdzYop3TPzfC4wm1RIE