[Shadow00000]

That's not it, the anime skipped the main event to not spoil manga, even though Kyosuke gives a few hints. I am refering to the anime being toned down means of violence, cruelty, sadism and/or gore (1)[see GS Mikami], and either hide or changed many facts on purpose, blood is still missing which is already a trouble if the anime follows the manga. While the character desing is 1:1 the expressions are different, mainly Kouichi's is changed drastically, his expressions were much more exaggerated and hilarius (similar to GSM / Yokoshima), the rest of the characters as well. I could go into the exact details episode by episode but it would too long. Ookama is also changed, the anime contradicts his own skills on the first episode.

(1) 4th/5th att.