Marronnier Kingdom Anime Sets Global Prime Video Debut

Prime Video has announced a worldwide exclusive release for The Seven Knights of the Marronnier Kingdom, giving international viewers a firm streaming date for the new fantasy-romance anime and its opening song by yama.

Amazon Japan announced the streaming plan on September 7, 2026. The anime will arrive on Prime Video at 12:00 a.m. Japan Standard Time on Sunday, October 4, after its scheduled Saturday evening broadcast on NHK E-Tele. Prime Video describes the title as a worldwide exclusive for Prime members, with new episodes scheduled every Sunday at midnight JST.

What Was Announced

The most practical news is the date and release pattern. The first episode is scheduled for October 4 at 12:00 a.m. JST, and the service is expected to continue weekly at the same time. The announcement ties that streaming window to NHK E-Tele’s Saturday broadcast at 6:25 p.m. JST, placing the Prime Video release several hours after the domestic television premiere.

Prime Video also confirmed that the anime is included as a Prime member benefit and noted that viewing requires membership. The release calls the arrangement a worldwide exclusive, but it does not publish a country-by-country service list or a separate breakdown of subtitle and dub languages. That distinction matters: “worldwide” is the announcement’s description of the deal, while the exact catalog display and language options may still be handled locally by Prime Video.

The same announcement confirmed the opening theme, “Sayonara wa Iwanai,” performed by solo singer yama. The official anime site credits yama and Seiji Kameda with the song’s lyrics and composition, with Kameda also participating as music producer. The newly released second promotional video previews the track and includes individual voice clips for the seven brothers.

A second cast announcement fills in several important roles around the brothers. Miyuki Sakurai will voice Eleonora, Natsumi Fujiwara will play Princess Brunhilde, Takehito Koyasu will play Elliot, Kazuyuki Okitsu will play Hugo, and Daisuke Namikawa will play Peregrinus. These additions make the central family and court relationships easier to follow before the series begins, although the official announcements do not yet provide a full English-language cast guide.

Why It Matters

This is a significant distribution detail for a title whose appeal is built around character relationships and a carefully constructed fantasy setting. The Seven Knights of the Marronnier Kingdom follows seven brothers raised by the kingdom’s female general. Each brother has a distinctive trait, and their shared ambition is to one day rescue a princess in style. They later travel as ambassadors to seven neighboring countries, where the story expands through new encounters, romance, and political or personal trials.

The premise comes from Nao Iwamoto’s manga, serialized in Shogakukan’s Monthly Flowers since 2016. The Amazon Japan announcement says the manga had reached eleven collected volumes as of September 7 and is being adapted for the first time around its ten-year serialization milestone. It also records the series’ first-place result in the women’s category of the 2018 edition of Takarajimasha’s This Manga Is Amazing! That background helps explain why this is more than a routine seasonal pickup: the anime is bringing a long-running, award-recognized romance-fantasy manga to a much wider screen audience.

For fans outside Japan, the global Prime Video plan could reduce one common barrier: waiting for a separate overseas licensing announcement. It may also make the show easier to follow week by week, since the official schedule is already anchored to a fixed Japanese release time. However, the word “could” is important here. The announcement does not confirm every territory, local storefront, or language track, so viewers should treat regional access as not yet fully confirmed until the title appears in their local Prime Video listing.

Context for International Fans

The first streaming time converts to Saturday, October 3, at 3:00 p.m. UTC. That is 11:00 a.m. Eastern Daylight Time and 8:00 a.m. Pacific Daylight Time in North America, 4:00 p.m. British Summer Time, and 5:00 p.m. Central European Summer Time. These conversions are based on the announced midnight-JST slot; Prime Video’s local display could still vary by account or territory.

Fans should also note the difference between the anime’s translated title used in English coverage and the Japanese title used on the official pages. Searching Prime Video with both the English title and the Japanese series title may be useful if the local listing is indexed before the international-facing metadata is updated. No purchase link or merchandise information is part of this announcement; the immediate access point is the Prime Video catalog.

The official site describes a medieval-style world centered on Marronnier Kingdom and the seven countries around it. That setup suggests a story that moves beyond the brothers’ home kingdom, but the release does not reveal how much of the manga the first cour will cover. Readers who want to avoid spoilers can start with the official second trailer, which is presented as a preview of the tone, voices, and opening theme rather than a complete story outline.

What Happens Next

The next firm checkpoint is the NHK E-Tele broadcast on Saturday, October 3, at 6:25 p.m. JST, followed by the Prime Video launch at midnight JST on October 4. Before that date, the most useful official updates will be a local Prime Video listing, confirmation of subtitle or dub availability in each market, and any final schedule notice from NHK or the anime’s official site.

International viewers should verify the episode page near launch rather than relying on a saved calendar conversion. The official release itself warns that availability and schedules can change. What is confirmed now is the weekly midnight-JST plan, yama’s opening theme, the second promotional video, and the expanded cast; regional presentation details remain not yet confirmed.

Sources

• Amazon Japan’s September 7 release — confirms the Prime Video worldwide-exclusive plan, October 4 premiere time, weekly schedule, story background, cast, and opening theme.
• Official anime homepage from NHK — provides the series introduction and links to the September 7 official updates.
• Official opening-theme announcement — confirms yama’s “Sayonara wa Iwanai” and the songwriting credits.
• Official second promotional-video announcement — confirms the new trailer and the seven brothers’ individual voice previews.
• Official second cast announcement — confirms the newly announced supporting cast members.

Information was checked on September 7, 2026, at 9:58 p.m. JST.

Editorial note: This report is based on the primary sources linked above. Availability, schedules, and announcements can change; verify the latest details with the official source.