Practical collecting guide
After My Hero Academia Box Set 1: Start With Volume 21
My Hero Academia Box Set 1 stops at volume 20, so volume 21 is the first numbered English manga volume after the set.
Start with My Hero Academia volume 21 after Box Set 1. VIZ says the English box contains volumes 1–20, while its separate volume 21 record identifies the next numbered paperback. The box’s poster and 48-page booklet are extras; neither replaces volume 21.
Use the 20 → 21 boundary
| What is on your shelf | Numbered manga coverage | First numbered volume not covered | What the box would add |
|---|---|---|---|
| Box Set 1 | 1–20 | 21 | Already owned |
| Box Set 1 plus volume 21 | 1–21 | 22 | Already owned |
| Singles 1–8 | 1–8 | 9 | Volumes 9–20; twelve new and eight repeated |
| Singles 1–20 | 1–20 | 21 | No new numbered coverage |
The Box Set 1 product page establishes the 1–20 range and ISBN 9781974735990. VIZ’s volume 21 page identifies the next English paperback and ISBN 9781974709502. Those records settle the handover without inferring contents from the box number.
Keep the bonus booklet outside the volume count
VIZ describes the premium as a 48-page booklet of bonus illustrations and author commentary originally printed on Japanese covers for volumes 1–20. That makes it documented bonus material, not a condensed volume 21. The double-sided poster likewise adds no numbered story coverage.
If you are checking a used set, separate two questions. A package can cover all twenty numbered books but lack its booklet or poster; conversely, a listing that shows the box and booklet does not prove every volume is present. Audit the books as 1 through 20, then check both extras individually.
Do not assume what “Box Set 1” promises next
The numeral in the product name identifies this box. It does not, by itself, establish the contents, release date or even existence of another box. This guide therefore answers only the verified next-volume question: volume 21 follows the 1–20 set.
For a partial shelf, the arithmetic is 20 box volumes − 8 owned singles = 12 new volumes. The duplicate-volume worksheet shows the same set-difference method for irregular gaps. If a retailer uses “complete,” check the documented scope rule before treating that word as the end of a series.