Yokohama Hakkeijima Sea Paradise is launching its 2026 summer holiday special campaign, the "Even-More-Ken-Matsudaira-Covered Island Summer Siege," starting Saturday, July 18. The "Ken Matsudaira-Covered Amusement Park" becomes even more covered in Ken Matsudaira, evolving into the "Even-More-Ken-Matsudaira-Covered Amusement Park," while the aquarium and hands-on areas also join in, putting Ken Matsudaira in charge of the entire island.
The "Even-More-Ken-Matsudaira-Covered Island Summer Siege" has already been picked up by plenty of news outlets and on social media, and now the full details for this summer are being revealed for the first time.
URL: https://www.seaparadise.co.jp/matsuken2026/
Campaign Overview
Ken Matsudaira and Yokohama Hakkeijima Sea Paradise are teaming up again. During Golden Week, their collaboration, the "Ken Matsudaira-Covered Amusement Park," became a huge hit and drew heavy crowds (the Ken Matsudaira Train saw waits of up to an hour). After receiving many requests for a longer run, this summer the amusement park evolves further into the "Even-More-Ken-Matsudaira-Covered Amusement Park," complete with new attractions (to be announced July 30, opening August 1). With the summer heat in mind, the Ken Matsudaira takeover also expands into the aquarium. In short, it all comes together as the "Even-More-Ken-Matsudaira-Covered Island Summer Siege," with Ken Matsudaira taking over the whole of Hakkeijima.
*The Golden Week "Ken Matsudaira takeover" features continue as they are, with even more being added this summer.
The campaign builds an extreme world where "Ken Matsudaira is everywhere you look" and "Ken Matsudaira Samba plays no matter what you do." From the moment visitors step inside, they're wrapped in Ken Matsudaira through everything they see, hear, and experience, in what's billed as an "over-immersive entertainment space." Numerous features raise the "Ken Matsudaira concentration" the more visitors take part, creating an unusual immersive experience where "before you know it, there's no escaping Ken Matsudaira all day." It's a theme park dominated by Ken Matsudaira like never before, blending laughter with bewilderment.
New for Summer
The Even-More-Ken-Matsudaira-Covered Aquarium
Ken Matsudaira Jellyfish Tank: Kaleidoscope
Japan's first tank where jellyfish dance around Ken Matsudaira to a faintly playing samba.
Location: Aqua Museum 3F, "Kurageum"
Note: Requires an aquarium admission ticket.
Ken Matsudaira Fish Display
At the Aqua Museum, a local fish nicknamed "Ken Matsudaira," caught in nearby waters, goes on display.
Location: Aqua Museum 4F, LABO 10 "Fish Schools Coloring the Coral Reef"
Note: Requires an aquarium admission ticket.
Matsupen Parade
Combining Ken Matsudaira and penguins, several "Matsupen" figures are set up along the parade road, creating a new hands-on area where visitors can take parade photos whether or not the penguin parade is happening.
Start Date: Thursday, July 30
Location: Fureai Lagoon
Note: Requires an aquarium admission ticket.
The Mouth of Truth
An otherworldly tank where South American sea lions swim inside Ken Matsudaira's mouth. Visitors can choose their favorite size: small, medium, or large.
Location: Fureai Lagoon
Note: Requires an aquarium admission ticket.
Animal Life Live! — With Extra Helpings of Ken Matsudaira Samba
Making its debut, a collaboration performance between dolphins and Ken Matsudaira set to Ken Matsudaira Samba II and other songs playing from start to finish.
Period: Saturday, July 18 to Monday, August 31, 2026
Showtimes:
- Saturday, July 18 and Sunday, July 19: 10:30 AM / 12:00 PM (collaboration version) / 2:00 PM / 4:00 PM (collaboration version)
- Monday, July 20 (national holiday) to Friday, July 24: 11:00 AM / 1:00 PM (collaboration version) / 3:30 PM
- Saturday, July 25 to Friday, August 7, Monday, August 17 to Friday, August 21, and Sunday, August 23 to Monday, August 31: 11:00 AM / 12:30 PM (collaboration version) / 2:30 PM / 4:30 PM (collaboration version)
- Saturday, August 8 to Sunday, August 16: 9:30 AM / 11:00 AM (collaboration version) / 12:30 PM / 2:30 PM (collaboration version) / 4:00 PM / 5:30 PM (collaboration version)
- Saturday, August 22: 11:00 AM / 12:30 PM (collaboration version) / 2:30 PM / 4:00 PM (collaboration version) / 5:30 PM
Location: Aqua Museum 4F, Live Stadium
Notes: Each show runs about 25 minutes. Sessions marked "collaboration version" above are delivered in the collaboration format; during those sessions, the splash-from-the-animals segment is not included (see the official Yokohama Hakkeijima Sea Paradise website for details). Which animal provides the splash varies by session, and the number of guests who can experience the splash is limited.
Ken Matsudaira Cruise
If the Ken Matsudaira Train covers land, this covers the sea — a fun cruise while Ken Matsudaira Samba II plays.
Start Date: Thursday, July 30
Departure/Arrival Points: Nishihama Pier / Hakkeijima Pier (*departure and arrival points vary by day and time; see the official Yokohama Hakkeijima Sea Paradise website for details)
Capacity: 140 guests
Cruise Duration: 15 to 30 minutes
Route: Waters around Hakkeijima
Price: ¥1,000 per ride for middle schoolers and up, ¥500 per ride for elementary schoolers (*can be used with the Sea Para Premium Pass, One Day Pass, or Pleasure Land Pass; *children ages 4 through preschool age ride free, up to 1 per accompanying adult)
Note: May be suspended or have its route changed depending on weather or wind conditions.
Ken Matsudaira Heatstroke Prevention Bubble Shooting
To keep Ken Matsudaira from getting heatstroke, this attraction has visitors give him mineral water to drink. *The water contains mineral components. *Aside from the water, it's the same attraction as the one held during the previous Golden Week.
Location: Sheeta's Dream Island
Price: ¥400 per play (charged from age 4; *can also be used with the One Day Pass, Pleasure Land Pass, or Sea Para Premium Pass)
Duration: About 2 minutes
Capacity: 2 guests per unit, 4 units
Note: No height or age restrictions.
Ken Matsudaira Mist
A new mist device debuts, showering visitors with a refreshingly cool mist called "Olé" (written "Oh-Rei") until they're left dazed.
Start Date: Thursday, July 30
Location: Plaza in front of the Aqua Museum
Expression-Changing Ken Matsudaira Train
A major evolution from Golden Week. From Thursday, July 30, the eyebrows and mouth become magnetic, letting the train's expression change — laughing, angry, or sharp and serious. *From Saturday, July 18 through Sunday, July 26, the same "Ken Matsudaira Train" from the previous Golden Week run operates around the island; the "Expression-Changing Ken Matsudaira Train" begins operating from Saturday, August 1. *The expression changes vary by day.
Departure/Arrival Points: Departs beside the Passenger Ship Terminal, arrives at the carousel; departs the carousel, arrives beside the Passenger Ship Terminal
Price: ¥300 per ride (charged from age 4; *can also be used with the One Day Pass, Pleasure Land Pass, or Sea Para Premium Pass)
Duration: About 10 minutes
Capacity: About 40 guests
Operating Days: Weekends, holidays, and select days only (*see the official Yokohama Hakkeijima Sea Paradise website for operating times)
Note: Children up to age 4 must be accompanied by a guardian aged 18 or older.
Ticket With Mask
A limited advance-sale ticket bundles the "One Day Pass" — covering all four aquarium facilities plus unlimited attraction rides — with a Ken Matsudaira mask. Wearing the mask while walking around the park turns the scenery into a world where "Ken Matsudaira is everywhere you look."
Includes: One Day Pass (4-facility aquarium pass plus attraction free pass); Ken Matsudaira mask
Price: Adults and high schoolers ¥5,900; seniors (65 and up) ¥4,300; elementary and middle schoolers ¥4,300; preschoolers (age 4 and up) ¥2,600
Sold At: Exclusively through the official Yokohama Hakkeijima Sea Paradise website (external site "asoview!"): https://www.asoview.com/channel/ticket/a8P7RulWwS/ticket0000053194/
Notes: The set ticket is sold in advance (online sales) only. Sales may end once the day's planned quantity is reached; mask stock is also limited, and mask distribution will end once supplies run out. At the special event on July 30, a limited number of masks are planned to be given out free of charge.
Beyond these, popular Golden Week features such as the "Ken Matsudaira Fishing Photo" continue as they are, and the aquarium and amusement park areas also hold numerous "secret Ken Matsudaira spots" and "secret tanks" not covered in this release.
Visitors are invited to enjoy the "Even-More-Ken-Matsudaira-Covered Island Summer Siege" at Yokohama Hakkeijima Sea Paradise.
Fireworks Symphonia
Yokohama Hakkeijima Sea Paradise will hold "Fireworks Symphonia," a live sound-and-light fireworks entertainment show, on seven days total between Saturday, July 18 and Monday, August 31, 2026. In this original Sea Paradise fireworks show, digital control synchronizes fireworks and music to within a tenth of a second, with about 2,500 fireworks launched over 10 minutes. Timed to songs including "Ken Matsudaira Samba II," the colorful fireworks color the night sky in "Fireworks Symphonia," making it the perfect way to close out a day of fun at Sea Paradise.
Dates: Saturday, July 18; Sunday, July 19; Saturday, July 25; Saturday, August 1; Saturday, August 8; Saturday, August 15; Saturday, August 29
Time: 8:30 PM to 8:40 PM (about 10 minutes each night)
Location: Around the Boardwalk, Yokohama Hakkeijima Sea Paradise
Note: May be canceled due to severe weather or other circumstances.
Ken Matsudaira Arrives on the Island July 30
To celebrate the island-opening of "Even-More-Ken-Matsudaira-Covered Island," Ken Matsudaira will make his appearance from the Ken Matsudaira Cruise. For the new attraction, he becomes more than 60 years younger, riding as its very first passenger.
Location: Communication Circle, Yokohama Hakkeijima Sea Paradise
Date and Time: Thursday, July 30, 2026, 10:30 AM to 12:00 PM (planned)
Note: Media coverage and photography by press are planned at the venue. Visitors may appear in photos or video taken during this coverage. Footage and images may be used in news reports and advertising without any mosaic processing applied; please be aware of this in advance.
