Mentalist DaiGo (real name Keigo Matsumaru) posted on X that he was annoyed by a fellow passenger repeatedly glancing at him on the Shinkansen, and revealed his own homemade fix for making the staring stop: writing out a realistic-looking assassination plot somewhere the person could see it, which made them get up and move away. The post was picked up by 5ch’s Geinou/Sports News+ board, drawing a mix of amazed laughter and mockery, along with accusations that the story was made up (‘usomatsu,’ 5ch slang for suspiciously convenient anecdotes) and references to DaiGo’s past controversies — leaving reactions sharply divided.
松丸 彗吾(keigo matsumaru) @k_matsumaru
I’m on the Shinkansen right now and the middle-aged guy next to me keeps annoyingly turning his head to glance over at me.
Stop it!!! Right at the edge of my vision!!!! So annoying!!!!!
Even an edgy chuuni kid wouldn't come up with this one.
12AnonymousSep 21, 2026 22:38
I just play a video meant to confuse the person next to me into thinking, 'W-what is this guy even watching???'
18AnonymousSep 21, 2026 22:40
Could you please change your name already?
26AnonymousSep 21, 2026 22:45
This isn't the other DAIGO — the one who gets absolutely wrecked by Junko, right? (likely a mix-up with the singer DAIGO of BREAKERZ)
29AnonymousSep 21, 2026 22:45
Just go watch Keiko Kitagawa's Sailor Moon video, that'll clear it up. (referencing the singer DAIGO's actress wife)
30AnonymousSep 21, 2026 22:46
Am I the weird one for not getting what's supposed to be funny here?
33AnonymousSep 21, 2026 22:46
Opened the thread thinking 'this is rough'…
and yep, this is mentalism alright.
34AnonymousSep 21, 2026 22:46
Who on earth is still paying this guy money?
50AnonymousSep 21, 2026 22:53
Re: #34
Daisuke Hori: 'Seriously, exactly.'
58AnonymousSep 21, 2026 22:55
Re: #50
Hori and the mentalist really do give off a similar vibe.
66AnonymousSep 21, 2026 22:59
Re: #50
That guy's whole thing vanished in an instant, huh.
35AnonymousSep 21, 2026 22:47
Depending on the seat layout, there's a chance the guy was just looking out the window at the scenery.
36AnonymousSep 21, 2026 22:48
For a second I got startled thinking it was the DAIGO from WISH (the pop duo) who said this.
38AnonymousSep 21, 2026 22:48
So he's showing off his inner 'menhera-list' side, huh
Pretty much business as usual for him.
43AnonymousSep 21, 2026 22:50
Still, I can believe someone'd get up and move just because it's too creepy.
46AnonymousSep 21, 2026 22:51
Wasn't it more like your earbuds were leaking sound everywhere, or your leg was bouncing like crazy?
55AnonymousSep 21, 2026 22:55
So lame — the second you realize it's this guy, you just leave.
60AnonymousSep 21, 2026 22:56
Apparently even this DaiGo is turning 40 this year.
61AnonymousSep 21, 2026 22:56
I wear them too, but I'd recommend blinkers.
70AnonymousSep 21, 2026 23:03
Wait, what? Is it unreserved seating? If so, couldn't he have just moved himself?
73AnonymousSep 21, 2026 23:05
So this is what they call 'usomatsu.'
Nobody actually looks at what the person next to them is writing.
And 'assassination' is just a lame, childish idea to begin with.
78AnonymousSep 21, 2026 23:06
This guy was on TV with a fake persona on the same level as Daisuke Hori, going on about 'mentalism' and whatnot.
79AnonymousSep 21, 2026 23:09
This is just collateral reputational damage for the DAIGO from WISH.
80AnonymousSep 21, 2026 23:09
'So that is the world's choice…'
eh, not quite the right quote for this.
83AnonymousSep 21, 2026 23:10
He's a mentalist — he should be doing this with words, not creepy notes.
Background and Key Points of This Story
DaiGo, whose real name is Keigo Matsumaru, has built a career sharing psychological techniques through books and videos, and drew criticism in 2022 over comments he made about homeless people. The ‘controversy’ referenced in the thread is believed to point to that incident. This latest post is simply DaiGo’s own account of his experience on X (formerly Twitter), with no third-party confirmation provided. The term ‘usomatsu,’ which came up repeatedly on 5ch, is site-native slang used to cast doubt on the truthfulness of anecdotal posts, often applied regardless of the poster’s actual intent. One point readers could easily misread: the ‘assassination plot note’ isn’t an actual criminal threat — by DaiGo’s own account, it was just a fictional stunt used to make the person next to him look away.
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