Kaiju No. 8 started its manga run in 2020 , while Attack on Titan’s manga began in 2009. So Attack on Titan came out about 11 years earlier.

Release timing

  • Kaiju No. 8 : first published in 2020.
  • Attack on Titan : first chapter published in the September 2009 issue, which was released on August 17, 2009.

Simple takeaway

If you’re comparing their debut dates, Attack on Titan is the older manga by a wide margin. Kaiju No. 8 is much newer and comes from the later wave of big shonen hits.

TL;DR

  • Kaiju No. 8: 2020
  • Attack on Titan: 2009
  • Difference: roughly 11 years