Ripped from you-know-where and converted using you-know-what.

The epub should work with most readers that support it, including Komga and Kavita.
To convert to JPG, use a converter like Calibre to convert to PDF then to ZIP.
(Converting from EPUB directly to ZIP may result in pages being out of order)
Conversion Guide - https://pastebin.com/04XAsfps
日本語でのJPG形式への変換手順ガイドはこちら - https://pastebin.com/8TTL9xJV

Software recommendations/EPUBを対応するアプリ
PC/Mac - https://thorium.edrlab.org/en/
iPhone - https://apps.apple.com/jp/app/apple-books/id364709193
Android - https://play.google.com/store/apps/details?id=org.readera&hl=ja&gl=US