Mushoku Tensei Season 3 Episode 13: Old Deus's Diary Reveals His Worst Timeline
『無職転生Ⅲ』第13話「日記」、老デウスの過去に日本のファン反応
Mushoku Tensei Season 3's Episode 13, "Diary," adapts the flashback explaining how the elderly Old Deus became the burnt-out husk fans have already met — retracing the same turning points present-day Rudeus lived through, except every one of them goes wrong this time.
Across the video's 209 comments, viewers spend most of the runtime processing exactly how bleak that alternate route gets, arguing over whether Rudeus deserves the blame for who he becomes, and comparing notes on how much harder the anime hits than the novels it's adapting.
By the end, more than one commenter admits they had to pause the episode partway through.
Mushoku Tensei Season 3 Part 2? How Many Episodes & the Episode 14 Finale →
Mushoku Tensei III's Episode 13, "Diary," adapts the flashback chapter that finally explains how the elderly, broken-down character everyone's been calling Old Deus got that way. Reading his diary retraces the same turning points present-day Rudeus already lived through — the same relationships, the same choices, the same people — except this time, every single one of them goes wrong. The channel behind this video pairs broadcast clips with its own running commentary rather than just reposting the episode, and its 209 comments spend the whole runtime processing exactly how bleak that alternate route turns out to be, one turning point at a time.
“So Eris kept loving him this whole time, even after he became this much of a piece of trash?”
こんな屑になってもエリスは愛し続けてたのか
It starts with losing Roxy, and everything after cascades from that single point — Sylphy gets pushed away and rejected, Eris keeps circling back into his life at the worst possible moments, and the man telling this story never actually gets the chance to recover from any of it before the next loss hits.
“Those final smiles from Sylphy and Roxy were the only thing that saved Old Deus in the end...”
最後のシルフィーとロキシーの笑顔が 老デウスの救いだった・・・
“He made a doll of Sylphy, and watching him slowly realize there's only ever going to be one real Sylphy was rough to sit through.”
シルフィの人形作ったけど、やっぱりシルフィは一人しかいないんだなって実感してるのが辛かった
Several commenters who've read the source novels say the anime somehow makes it worse, not better — and that's despite the adaptation reportedly softening a few details along the way.
“Seeing it animated really does make it worse. And this is apparently even a little more toned down than the novel — the path Old Deus walked is just... 🤢”
やっぱり映像化するとエグいし辛い。これでも原作より若干、ちょっとだけマイルドにはなってるけど老デウスの歩んだ道は…🤢
“For anime-only viewers, this one hits harder than the source material in terms of how brutal it feels.”
アニメ勢の皆さん辛さで言えば原作よりインパクトあります
“This is the first time an anime has ever made me actually throw up.”
アニメ見てゲロ吐いたのこれがはじめてです。
That's where the thread splits into an actual argument. Some viewers won't let Rudeus off the hook for who he becomes down this path; others point at the god quietly steering him there in the first place.
“Realistically, no matter which route he took, the potential to become trash was always in him.”
実際どの道を辿ってもクズの素質はあるからな〜
“Where exactly is he trash, though? This is just what real people are like.”
どこが屑なんだろう？リアルの人間ってこうでしょ
“Sure, Rudeus is trash, but it feels like Hitogami keeps sabotaging him right when he might recover — using Luke to keep him away from Sylphy after the brothel incident wrecked things once already, then timing the big reveal to empty the house so he can't spend his last years with Aisha before the attack hits.”
ルーデウスがクズなのはそうだが立ち直るタイミングでヒトガミが邪魔してる感じする、娼館目撃されて関係崩壊は前に後悔したのでその後会話させないためルーク使って離させて、ネタばらしもアイシャと余生を過ごさせないように家空けさせて襲撃させてるのでは
Not every comment is despair, though. Plenty are relieved the show pulled this off as well as it did, both in how it paced a chapter this heavy and in the voice booth behind it.
“Good thing Episode 12 primed us for this one. Watching 13 cold, without 12, would've broken me. If the story had just moved on without ever showing 13, it would've been a shrug. And if they'd stretched 13 out to three episodes' worth of runtime, it would've just been a depressing anime for the sake of it.”
12話で予習できててよかった 12話無しで13話見たら心折れてた 13話無しで話が進んでいたら フーンそうなんだで終わってた 13話を3話ぐらいの尺で見せられてたら ただの鬱アニメになってた
“That last vision at the end gave Old Deus a small bit of peace, I think. Sugita's performance was incredible from start to finish.”
最期の未来視で老デウス、 少しだけ救われたなと。終始 杉田さんの演技力が凄まじかった
“It's wild that Sugita carries this episode more than Uchiyama does. Mushoku Tensei's always split light and dark between the two of them — Uchiyama's the light, Sugita's the dark — so having the dark side take the lead this time felt genuinely sad.”
今回は内山さんより杉田がメインでやっているのがヤバい。無職転生は光が内山さん、影（闇）が杉田が担当していたので今回は闇がメインでやっているのが悲しいと感じた。
And then, right on cue, somebody points out the timing.
“Um... today's actually Respect for the Aged Day, you know....”
あの....今日、敬老の日なんですけど....
Japan's national holiday for honoring its elders landed the same week this show put its oldest character through the single worst version of his life it could imagine, and nobody in the comments seems willing to let that coincidence go unremarked. Between the voice acting, the pacing, and a timeline this unforgiving, Episode 13 isn't the kind of watch anyone in the thread describes as easy — but almost none of them say they regret it either.
FAQ
- What happens in Mushoku Tensei III Episode 13?
- Titled "Diary," the episode adapts the flashback chapter that explains how the elderly Old Deus became the burnt-out figure introduced a few episodes earlier — retracing the same turning points present-day Rudeus lived through, except every one of them goes wrong.
- Do Japanese fans think the anime is harder to watch than the novels?
- Several commenters who've read the source material say yes — even though the anime reportedly softens a few details compared to the novels, seeing the events animated makes the episode hit harder for them.
- Is Rudeus to blame for the timeline shown in Episode 13?
- Commenters are split. Some argue he had the potential to end up this way regardless of circumstances, while others point to the god Hitogami repeatedly sabotaging him at the moments he might have recovered.
Mushoku Tensei Season 3 Episode 13 Preview: Fans Brace for the Diary Arc
“Looks like they're handling this more carefully than I imagined, and now I'm worried about my own mental health.”
Read this roundupThis is one of 28 Japanese-reaction roundups for Mushoku Tensei. See them all →
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