Fights from the anime Kenichi: The Mightiest Disciple

 https://www.youtube.com/watch?v=i2UWLiF70Wo - 4:05 to 22:30

https://www.youtube.com/watch?v=FW_nQ4yfRKg - 7:30 to 17:30

https://www.youtube.com/watch?v=bmI9fUWPPP4&t=3s - beginning to 20:35