Is there an app for reading the mainstream manga?

I've tried apps for my iPhone that get really good reviews but they never have the manga I want. I want to read this manga I really like called katekyo hitman reborn but it doesn't show up even if it's on the website the app uses as a source. What's up with that?

Search up mangareader. The icon should have "MANGA" in orange and "READER" in blue. I know for a fact that it has KHR, as well as other similar titles such as:

Hunter X Hunter
Nura: Rise of the Yokai Clan
Bleach
Eyeshield 21
One Piece
Beelzebub
Kenichi
The Breaker
Pandora Hearts

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