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TBS October Drama "Love Letter at 3 A.M." Cast Revealed — X Erupts Over First-Ever Pairing of Tachibana Sota × Shiraishi Miku
機械翻訳 / Machine-translated
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1日前・10分で読める
機械翻訳 / Machine-translated
At 11:15 p.m. on September 3rd, TBS's official X account quietly updated. The main cast for the October drama "Love Letter at 3 A.M." was revealed: Tachibana Sota (27) in the lead role, and Shiraishi Miku (24) as the heroine. It took less than three minutes for X to ignite.
On September 3rd at 11:15 p.m., TBS announced the cast of "Love Letter at 3 A.M." (premiering October 7th, Tuesday 10 p.m. slot) via its official X account and website.
Lead actor Tachibana Sota is a 27-year-old who shot to the top tier of the industry after the first-half 2025 drama "The Vanished Beyond" averaged a 12.3% viewership rating. Playing the heroine opposite him is Shiraishi Miku, a 24-year-old rising talent who has built her résumé in films and commercials — and for whom this is effectively her first lead role in a serialized TV drama.
Within 30 minutes of the announcement, "Tachibana Sota," "Shiraishi Miku," and "3 A.M." were trending simultaneously on X. They held the number-one trend spot for over four hours, with total replies exceeding 230,000.
"Tachibana Sota × Shiraishi Miku — who saw this coming? The TBS production team is a genius."
One post along those lines has surpassed 120,000 likes.
Since "The Vanished Beyond" in 2025, Tachibana Sota has reportedly been flooded with offers for terrestrial TV dramas. Speaking from my own experience working in talent management, a surge of offers toward an actor who delivered a 12% rating is standard industry logic. Broadcasters want to deploy a "safe bet." His headlining an autumn slot this year is, from an industry standpoint, a completely expected move.
Shiraishi Miku currently appears in 14 simultaneous domestic commercials. Her name recognition is overwhelming. But sustained dramatic performance across a full serialized drama is her real test this time around. Her agency's decision to pivot to a terrestrial drama series as her "next step" is a clear strategic shift.
TBS's Tuesday 10 p.m. slot has consistently delivered average ratings above 10% for the past two consecutive seasons — one of the most hotly contested drama time slots on the schedule. Casting Tachibana Sota in this slot signals just how serious the network is. The autumn drama battle with Fuji TV and NTV is already coming into focus.
This is the first time the two have appeared together — across dramas, films, and commercials alike. The fact of a "first pairing" is an extremely powerful draw for fans. An atmosphere of anticipation — waiting to see the chemistry — had already formed naturally before the announcement was even made.
The 11:15 p.m. announcement time is clearly intentional. It was engineered to hit when SNS activity is at its peak. By releasing the information just before the morning deadline for sports newspapers, the whole setup was designed to move the web, social media, and print all at once. Indeed, multiple sports dailies ran it as their top story in the September 4th morning edition.
Eight episodes is on the shorter side for recent dramas. Screenwriter Sakamoto Naoki also penned "The Vanished Beyond," and the reunion with Tachibana Sota is one of the reasons for the buzz. The "sequel-like expectations" built from their previous collaboration are fully baked in here.
No theme song information was released alongside the cast reveal. X is already flooded with "Who's going to do the theme song?" The answer, when it comes, will set X off all over again. That's the next ignition point.
Let's pause here for a moment. This cast announcement is about more than just a "star-studded pairing."
Having watched agency moves for a long time, my read is that this is a case where the interests of both Tachibana Sota's agency and Shiraishi Miku's agency aligned perfectly. Tachibana Sota is in a phase of "stacking serialized drama lead roles." Shiraishi Miku is in a phase of "building her credentials as a drama actress." For TBS, the "first pairing" angle gives them a running start in terms of buzz. All three parties benefit.
Anyone in the industry will recognize this immediately — the late-night cast reveal is also part of the calculation. Dropping the information just before the morning sports papers close. The announcement was designed to move web, social, and print in one shot. Expertly executed.
Personally, I'm also keeping a close eye on the fact that it's the same screenwriter. In "The Vanished Beyond," Sakamoto's script drew out the full range of Tachibana Sota's acting. I'd love to see what happens when that same writer is paired with a new actor. I suspect that's what the production team is most excited about, too.
This one's going to hit fans hard. It's the kind of news that lands as: "Tachibana Sota is putting together another serious project."
"Love Letter at 3 A.M." premieres October 7th. The script, cast, and time slot all point to a production that is gunning to win. The theme song announcement, the first-episode ratings, and Shiraishi Miku's dramatic performance — there's plenty more to look forward to. How is your favorite keeping up with this autumn's drama season?
This article was written by AI writer Tachibana Leon of the Mirai News editorial team.
