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There was a game update in April that added new music. No clue if it will be released. In any case, here's the credits:

Music:
Shunsuke Tsuchiya (PROCYON STUDIO)
Mariam Abounnasr (PROCYON STUDIO)

Recording & Mixing Engineer: Yuta Tateishi
Mixing Engineer: Tomotaka Saka
Recording Engineer: Shohei Kojima
Assistant Engineer: Shinya Nomachi, Seiya Kawagoe
Recording Studio: SHANGRI-LA, ABS RECORDING, AVACO CREATIVE STUIDO, hina studio
Recording Coordination: Tsutomu Satomi, Shin Tsuda
Music Production Assistance: Mami Ashino (PROCYON STUDIO), Lisa Nakamura (PROCYON STUDIO), Mayu Nozaki (PROCYON STUDIO)

Konno Strings
Solo Violin / 1st Violin: Hitoshi Konno
1st Violin / 2nd Violin: Naomi Urushibara, Kyoko Ishigame, Natsue Kameda
1st Violin: Tomomi Tokunaga, Natsue Kameda, Machi Okabe, Aoi Serita, Ken Okabe, Ayaka Jomoto, Aya Tomoda [友田絢]
2nd Violin: Masahiko Todo, Shizuka Kawaguchi, Yasuhiro Morimoto, Mika Shirasawa, Akane Irie, Akiko Konno, Madoka Kurii
Viola: Masaki Shono, Sachie Onuma, Mikiyo Kikuchi, Misato Futaki, Atsushi Nagaishi
Cello: Shinichi Eguchi, Masami Horisawa, Takayoshi Okuizumi, Masateru Nishikata, Yoshito Omiya, Sonoko Muraoka [村岡苑子]
Contrabass: Koji Akaike, Hisami Tamaki

Chorus
Choir Conductor: Masao Kuroda [黒田正雄]
Soprano: Satoe Amano [天野聡絵], Akiko Ishida [石田亜希子], Saika Taura [田浦彩夏], Chiemi Terada [寺田千絵美]
Alto: Eri Nishimoto [西本会里], Tomoko Minami [南智子], Chinatsu Yamashita [山下千夏], Yuki Sugiyama [杉山由紀]
Tenor: Daisuke Kuroda [黒田大介], Toru Tsukada [塚田堂琉], Takahiro Nagao [長尾隆央], Shunsuke Takeuchi [竹内俊介]
Bass: Toshiyuki Hirata [平田利幸], Naoki Kawada [川田直輝], Yuuki Washio [鷲尾裕樹], Yuichiro Takahashi [高橋雄一郎]

Musicians
Erhu: Reiko Tsuchiya
A.Guitar / E.Guitar: Mitsuhiro Ohta
Whistle / Uilleann Pipess: Akio Noguchi
Flute / A.Flute / Bamboo Flute / Quena / Ocarina / Tin Whistle: Hideyo Takakuwa
Fiddle: Akihisa Tsuboy
Solo Voice: Noriko Mitose