kiyotaka_chang said:
0:00~0:05 Shinya Ohira(presumed)
0:06~0:13 Atsushi Yano(presumed)
0:14~0:18 Shinya Ohira(presumed)
0:19~0:23 Atsushi Yano(presumed)
0:24~0:31 Hidetoshi Omori(presumed)
0:32~end Hidetoshi Omori(source: his YouTube channel)

https://www.sakugabooru.com/post/show/132316
Water effects probably created by Omori of other works.