Happy!: Kanzenban is a 15-book series with 15 primary works first released in 2003 with contributions by Naoki Urasawa, Marc Bernabé, and 浦沢直樹.
2003 • 1 Reader • 314 pages • 4
2004 • 1 Reader • 320 pages • 4
2004 • 1 Reader • 320 pages • 4
2004 • 1 Reader • 312 pages • 4
2004 • 1 Reader • 328 pages • 4