I just bought digital manga from Honto.jp ...
Problem is that I don't know how to convert it into .png/.jpeg I tried following the instructions posted on the internet about converting it but I'm just not going anywhere at all.

Can someone please help me!!!

What format is it in?

it's in XHTML format

I'm not sure if that's gonna do the trick, but you can try using winrar or 7-zip to extract the files. You might have to change the extension to .zip first though.
That's just a guess off the top of my head, so it might be wrong. I'm not really willing make a purchase to test it out.

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You can PM me if you need a temporary (freelance) cleaner/redrawer for some project. Especially if it's something with nice art.
Being the lazy person that I am, I'm not likely to accept anything long-term though.

Aren't these digital manga from honto.jp, ebook japan, amazon.co.jp all full of DRM? IIRC, you can only read these using their app from computer/ios/android.

There's no way to extract them.

It's going to be hard. Very hard until unless you post some of that xhtml code somewhere. Try asking on stackoverflow or something like that. it MIGHT work out...

XHTML is basically from XML... If you know JAVA a little bit, try JSoup , it can work on xHTML, parse it and stuff..

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Thank You,
Saiko Scans

Have you tried taking screenshots of it? Then pasting those in an image program such as paint and saving it?

If that works you could set up an autohotkey script to go next page, save it and so on.