---N5

• ... no kotoba - lvl1 (barely counts as a book ngl)
• 十二支のはじまり - lvl12
• son gokuu - lvl12

--- N4

• issunboushi and other yellowbirdproject stuffs - lvl17

--- N3

• nihon no youkai - lvl22?
• lulu & lala - low 20s
• tokimeki yume stuffs - lvl20~25
• hoshi no ouji - lvl23~25
• japanese folktales for lang learners - lvl25

--- N2

• japanese stories for lang learners - lvl27!?
• yoru no picnic - lvl28
• chuumon no ooi - lvl28
• natsu no niwa - lvl30
• hashire meros- lvl33
• kareshi no furi - lvl30+

--- N1

• bookworm - late 20s early 30s
• masei no ko (juuni kokuki) - lvl33
• hakase no aishita - lvl34
• boku wa benkyou dekinai - lvl35?
• nihonteki kazoku - lvl32+
• jigokuhen - lvl38

--- hell yea you da goat

• bocchan - lvl41
• 潮騒 - lvl44

idk: nihon no kamisama　(elem school, n3?), la monetta (probably elem school, n3?), chuutou (akutagawa, so probably advanced) (read plenty of magazines too :3 and grimm's. and renshuu book club!!)