https://www.mangaupdates.com/series/w8woai0

These are the digital store chapters released by Square Enix outside the Manga UP! App – therefore these are tagged with (Square Enix).
Chapters provided by DigitalMangaFan, denoised, grayscaled, and lossless optimized x2231 PNG images, split dual-pages are merged.

These compiled volumes include raw pages from the Japanese volumes to keep the page count and numbering correct for ‘complete’ tank-style volumes.

These volumes start with right-side page first (no inner cover page), start with two pages on dual-view readers for correct page order.
All image filenames are tagged and are having page numbers according to the ToC.

The Isekai Returnee is Too OP for the Modern World 001-021 as v01-05 (Digital-Compilation) (Square Enix) (Oak)