[jippy]

I tried to convert CBR to MOBI using Calibre, result is okay but text to small to read.

After that i tried using k2pdfopt to convert folder with manga images inside,
using options -ui- -w 758 -h 1024 -ls -m 0 -f2p 100 -x

This program will automatic create landscape manga with max width.

Result is better than using calibre, easier to read.