7 books in series

What did you eat yesterday?

What did you eat yesterday? is a 7-book series with 7 released primary works first released in 2007 with contributions by Fumi Yoshinaga.

What Did You Eat Yesterday?, Volume 1
What Did You Eat Yesterday?, Volume 2
What Did You Eat Yesterday?, Vol. 3
What Did You Eat Yesterday?, Vol. 4
What Did You Eat Yesterday?, Volume 5
What Did You Eat Yesterday?, Volume 6
What Did You Eat Yesterday?, Volume 7