Protagonist **Iori Kitahara**, who comes to a seaside town in Izu for university, lodges at his uncle's diving shop "Grand Blue" and gets dragged into the **booze, nudity, and silly antics** of his seniors.
The greatest charm is the gap between beautiful diving scenes and outrageous revelry.
**Season 3** is a new arc that moves the stage to **Palau**, the first overseas setting. Premieres July 6, 2026 🤿
📝 魅力・見どころ・特徴 ネタバレ控えめ
01① The Gap Between Diving and Wild Revelry
The greatest charm is the huge swing between beautiful **diving scenes** and **booze-and-nudity revelry**.
From the soothing footage of clear underwater to the seniors' full-throttle silly feasts — this gap brings huge laughs.
A one-of-a-kind work with high completion as a youth comedy 🤿
02② The Dragged-Along Protagonist Iori Kitahara
Protagonist Iori Kitahara is a college student who came to town dreaming of a rosy campus life.
But what awaited was booze-and-nudity silly seniors — and he's tossed around by days opposite his ideal.
As a man of common sense who becomes the straight man, Iori's woes and growth bring the laughs 😂
03③ Season 3: The First Overseas Palau Arc
In Season 3, the stage moves from Izu to **Palau**, the first overseas setting.
To help the diving shop's Palau venture, Iori and the others head out to the southern blue sea.
Watch the friends' high-energy feasts, unchanged even overseas, and the fresh Palau sea 🌴
04④ Distinctive Silly Seniors
The lead-level characters are the silly, full-throttle seniors.
Quick to strip, quick to drink, quick to make noise — the outrageous seniors create hilarious situations every episode.
The banter of strongly idiosyncratic characters is the work's addictiveness 😆
05⑤ Produced by Zero-G × Saber Works
Produced by Zero-G × Saber Works.
The distorted "silly-face" gag art and the beautiful diving background art — drawing both extremes is the charm of this work's animation.
Look forward to that range in Season 3 too 🎬
06⑥ OP by FUNKY MONKEY BΛBY'S
The opening theme is "Natsuko" by FUNKY MONKEY BΛBY'S.
The ending theme is "Hadaka no Mermaid" by Mameshiba no Taigun.
Upbeat songs perfect for summer and revelry heat up the work 🎵
07⑦ For Fans of Hilarious Youth Comedies
A simply hilarious youth comedy by Kenji Inoue ('Baka and Test').
Perfect for those who want to laugh out loud without thinking hard.
A work perfect for summer, offering the refreshment of diving and full-throttle silliness at once ☀️
08⑧ 📺 Broadcast & Streaming Info
Premiere: July 6, 2026 (Mon)~
Channels: TOKYO MX, BS11, MBS and others
Studio: Zero-G × Saber Works
Check the official site for the latest info 📱
💡 注目ポイント・展開予想 軽めネタバレ
Season 3 is expected to center on the new arc that moves the stage overseas to Palau for the first time.
It depicts Iori and the others heading to the south to help the diving shop's Palau venture.
The silly antics unchanged overseas, and diving in Palau's beautiful sea — what hilarious episodes emerge in the fresh setting is the biggest point to watch.
🧾 これまでのあらすじ ネタバレあり
Iori Kitahara, who came to a seaside town in Izu for university, lodged at his uncle's diving shop "Grand Blue."
He dreamed of a rosy campus life, but what awaited was diving-club seniors reveling in booze, nudity, and silly antics — and he was dragged into their outrageous revelry.
Through Seasons 1 and 2, Iori touched the appeal of diving with his friends and reveled in a silly youth. In Season 3, the stage moves overseas to Palau for the first time.
✅ 観る・注目するおすすめポイント
Wholeheartedly recommended for fans of simply hilarious youth comedies.
Perfect for those who want to laugh out loud without thinking hard.
A work perfect for summer, offering the refreshment of diving and full-throttle silliness at once.
👀 トリビア・驚きの小ネタ集
・Original author Kenji Inoue is also known for 'Baka and Test.'
・The title "Grand Blue" comes from the blue sea seen while diving.
・Season 3 is set in Palau, the series' first overseas setting.
💫 未回収の伏線 ネタバレあり
Points to watch in Season 3:
● What new silly antics unfold in Palau, the first overseas setting?
● The diving scenes in Palau's beautiful sea.
● The laughs created by newly joining characters.
● Do Iori's struggles as the "straight man" continue overseas too?
● Does the diving shop's Palau venture go well?
● Fans' hopes rise for the fusion of the staple revelry and a fresh overseas setting.
💌 次シーズンで絶対バズる名セリフ予想
● "For now, let's drink."
—The catchphrase of seniors who turn everything into a feast.
● "Why does it always end up like this…!"
—The soul-cry of the man of common sense, Iori.
Iori's retorts as he keeps getting dragged into silly situations, and the seniors' rampages, bring huge laughs every episode.
Season 3 should bring new lines set overseas 🤿