"Haven't You Heard? I'm Sakamoto Volume 4" is a paperback comic book published by Seven Seas Entertainment in 2015. The series, written and illustrated by Nami Sano, falls under the Teen genre and features cover art by Nami Sano as well. The comic book is part of the "Haven't You Heard? I'm Sakamoto" series, which follows the story of a high school student who is known for his cool and mysterious persona. This particular volume is a rare find with the ISBN 9781626922884.