My other strong recommendation for "starter books" is the 君が見つける物語 series. They're anthologies of short stories specifically chosen for a teenage audience, and they have a 'scary' one, a 'friendship' one, a 'love' one, a 'mysterious' one, etc, so you can choose something to suit your interests. They tend to have furigana over most of the kanji that are above 6th-grade level.
The nice thing about reading short stories when you're at a lower reading level is that you don't get bored waiting for something to happen even if you read really slowly.
The nice thing about reading short stories when you're at a lower reading level is that you don't get bored waiting for something to happen even if you read really slowly.
