What WaniKani level can I read manga at?
Almost any of them, almost immediately, and that is not the useful answer. Nearly every manga a beginner reaches for prints furigana over every kanji: Chi's Sweet Home, Yotsuba, Doraemon, Demon Slayer, One Piece, even Death Note all carry Learn Natively's Full Furigana 100% tag. With furigana, kanji knowledge is not what stands between you and the page.
Your WaniKani level sets how fast the page goes. Grammar sets whether the page means anything. The chart below is graded by readers, not by kanji count, and the fourteen-level spread between Yotsuba and Vagabond is almost entirely made of things WaniKani does not teach.
Community difficulty grades for the usual suspects
Learn Natively crowd grades, August 2026, with the site's approximate JLPT overlay: L13-19 is roughly N4 territory, L20-26 N3, L27-33 N2, L34-40 N1. Yotsuba's grade rests on 544 ratings; Vagabond's on 11, so read that one loosely.
How much grammar before the first volume
About N5, or the end of Genki 1. That is what the WaniKani forum's Absolute Beginner Book Club asks of new members, and its entry requirements say outright that with furigana, kanji knowledge is not essential. Ask the level question directly and the answer that comes back is that it was the wrong question: more grammar will help a reader faster than more WaniKani.
So run a grammar resource alongside WaniKani from early on. Genki I covers roughly N5 and Genki II takes you to N4; Tae Kim's guide is free and covers similar ground; Bunpro drills grammar points in an SRS, which stacks neatly onto a WaniKani habit. Keep a dictionary within reach at every level: manga vocabulary runs past WaniKani's 6,000 words quickly, onomatopoeia and slang first.
The default first pick still humbles people
Yotsuba&! is the standard recommendation, and the trap is the word "beginner". Natively grades it L17, around N4, and Tofugu's review recommends it after Genki, not during. Readers who opened it on N5 grammar have left threads saying so, and one from January 2023 is titled, in full, "Attempting to read よつばと has been a humbling experience".
Two things do the humbling. Yotsuba herself speaks almost entirely in hiragana, so her lines give you no kanji to split words on, and comfort tends to arrive only after the first 20% or so. And readable does not mean lookup-free: a level-27 reader was still looking up 10 to 15 words per chapter. Budget for both. That is what reading looks like at this stage.
If you would rather be walked through it, GaijinQuest's channel works through Yotsuba's opening pages line by line, and the first episode spends 35 minutes on exactly the pages that trip people up.
For something gentler, Chi's Sweet Home sits two steps below at L15: a kitten's slice-of-life, full furigana, short volumes. Above Yotsuba the climb is not about kanji either. Shirokuma Cafe grades higher because of wordplay, since a pun charges you for two readings at once. Demon Slayer's extra weight is folklore vocabulary, which at least recurs until you own it. One Piece is the one people underestimate, hardest of the shounen picks here on dialect, invented words, and the sheer amount of text per page.
Where the furigana ends
Forum advice keeps repeating that Death Note drops its furigana after volume 1. It does not. Death Note ran in Weekly Shounen Jump, which puts furigana on every kanji as house style; volume 1 carries the Full Furigana 100% tag, volume 13 grades L31, and there is no cliff at volume 2. What is true is that it is hard, and the difficulty is register: police and legal vocabulary, formal speech, monologues that run for pages. Furigana tells you how to pronounce 捜査本部. It does not tell you what one is.
The real furigana cliff arrives with seinen magazines and prose. Vagabond is a period piece and the era is the wall, with older speech patterns and a vocabulary of historical terms. The Monogatari novels close the chart at L37, and they are not even manga.
If you still want your WaniKani level to mean something, read it as comfort guidance rather than a threshold. Around level 10-15 the furigana on Chi or Yotsuba turns from lifeline into spot check. Around 30 a Jump page is mostly kanji you know on sight, which is the difference between reading Demon Slayer and deciphering it. Past 40 the shelf where furigana stops being guaranteed opens up. Those pairings are ours; no crowd grades them, and the grammar bar outranks all three.
Too easy is the right difficulty
The advice with a methodology behind it comes from tadoku, the extensive-reading movement: start with books that are too easy, easy enough to enjoy without a dictionary, and climb from there. Slightly-too-easy gets finished; slightly-too-hard stalls in chapter 2. Rereading something you already know in translation works on the same principle, letting the plot carry you across the vocabulary gaps.
For the practical side: browse Natively and filter by level to find the next one. Bookwalker's Japanese store is where the Japanese-language editions live (the global storefront at bookwalker.com sells English translations, a different errand). On a screen, Yomitan pop-up-defines anything you hover, and mokuro OCRs raw scans so Yomitan works on those too.
For anything from the far end of the ladder, where furigana no longer papers over the gaps, paste a sample chapter into Can I read this? It reports what share of the text's kanji you have learned and lists the ones you have not.