Story wise, not that impressive. The artwork is great as usual form murata. The characters design are not that interesting even though physically they look great but their personalities are unimpressive.
Black sperm is probably one of the most interesting villain design i have seen in a long time in term of its physical design and its personalities. Read the webcomic if you want to know why.
That was an unexpectedly short battle. Even child emperor vs phoenix man battle is longer than this. Maybe Orochi is not dead yet ?
Since I dont read the webcomic by One, I thought the Final Battle for this arc would be Saitama meets Orochi but I am glad I was wrong.