Chainsaw Man. Book 9. I Want to See the Penguins!

Asa invites Denji on a date, not even suspecting that he is actually Chainsaw Man. The girl decides to follow Yoru's advice: to make the guy fall in love with her, and then turn him into a powerful weapon capable of defeating the main enemy, the war demon. The young people go to the city aquarium, and it seems that everything is going according to Asa's plan... However, her plans are ruined by the sudden appearance of Chainsaw Man's long-time rival!

The ninth book includes chapters 113–122.