The trailer features stylized motion graphics of manga panels from the series, highlighting major characters and action sequences from the Katana Man and Bomb Girl arcs leading up to Volume 9.
The feature you are referring to is the (Promotion Video) released to commemorate the launch of Chainsaw Man Volume 9 . This specific trailer, titled " 『チェンソーマン』9巻発売記念スペシャルweb CM ," was published on the Jump Comics Channel on YouTube on November 3, 2020. The trailer features stylized motion graphics of manga
Chainsaw Man: Story Arcs List in Order, Chapters & Episodes - Yahoo The trailer features stylized motion graphics of manga
Celebration of Chainsaw Man Volume 9's release in Japan. The trailer features stylized motion graphics of manga