[CHz]

From the end creditses:

KF1: "Music Composer: Koji Endo, Kaoru Kono"
KF2: "Music Compose & Sound Effect: SOUND KID'S Corp." (SOUND KID'S is Koji Endo's company; the end credits at least don't include specific names)
KF3: "Music & Sound Effect: SOUND KID'S Corp. - Kohji Endoh, Kaoru Kohno, Takashi Aoki, Yasushi Kawakami, Yasunobu Suzuki" (no indication who did music and who did SE)
KF4: "Sound Team: Tsukasa Saitoh, Yuji Kanda, Yuki Ichiki / Sound Director & BGM Composer: Tsukasa Saitoh" (Kanda's and Ichiki's roles are unclear)