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Captain Momo’s Secret Base (2023) manga review

Captain Momo’s Secret Base (2023) manga review

Update: 2025-09-05
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Editor’s note: all manga pages in this review are read from right to left in the traditional Japanese fashion.

<figure>
<source type="image/webp" />A manga illustration of Captain Momo lying nude on the floor of her spaceship, surrounded by books. She reclines with one arm behind her head and a contemplative expression, while a black-and-white cat sleeps nearby under a straw hat. Text panels describe her decision to keep a discovery from corporate headquarters, vowing instead to use it “only for ennui.”
<svg class="lucide lucide-refresh-cw" fill="none" height="20" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" viewBox="0 0 24 24" width="20" xmlns="http://www.w3.org/2000/svg"><path d="M3 12a9 9 0 0 1 9-9 9.75 9.75 0 0 1 6.74 2.74L21 8"></path><path d="M21 3v5h-5"></path><path d="M21 12a9 9 0 0 1-9 9 9.75 9.75 0 0 1-6.74-2.74L3 16"></path><path d="M8 16H3v5"></path></svg>
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<figcaption class="image-caption">Captain Momo passes the time aboard the Blue Chateau with books, naps, and a philosophy of ennui | Captain Momo’s Secret Base by Kenji Tsuruta</figcaption></figure>

Alone aboard the space freighter Blue Chateau, Moshi-Moshi Momo sits upon piles and piles of books, working out how to make sure the ship and its cargo reach their interstellar destination with the limited resources available. It’s a lousy job, but somebody’s gotta do it.

There are perks, though: Momo, being the only human aboard the ship, never has to wear clothes except for the few times when she checks in with her boss. The sheer number of old books around her means there’s always something to read. She has VR games to play, vintage model trains to build, and she tweaked the onboard meal replicator to create things for her besides food, like more books!

<figure>
<source type="image/webp" />A surreal manga scene showing a giant cat with glowing eyes charging down train tracks, while smaller panels depict Captain Momo nude, running after her cat Grandpa John, who is playing dangerously with toy train tracks. She cries out to stop him from causing a derailment.
<svg class="lucide lucide-refresh-cw" fill="none" height="20" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" viewBox="0 0 24 24" width="20" xmlns="http://www.w3.org/2000/svg"><path d="M3 12a9 9 0 0 1 9-9 9.75 9.75 0 0 1 6.74 2.74L21 8"></path><path d="M21 3v5h-5"></path><path d="M21 12a9 9 0 0 1-9 9 9.75 9.75 0 0 1-6.74-2.74L3 16"></path><path d="M8 16H3v5"></path></svg>
<svg class="lucide lucide-maximize2 lucide-maximize-2" fill="none" height="20" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" viewBox="0 0 24 24" width="20" xmlns="http://www.w3.org/2000/svg"><polyline points="15 3 21 3 21 9"></polyline><polyline points="9 21 3 21 3 15"></polyline><line x1="21" x2="14" y1="3" y2="10"></line><line x1="3" x2="10" y1="21" y2="14"></line></svg>
<figcaption class="image-caption">Captain Momo chases after Grandpa John as his mischief threatens a miniature train disaster | Captain Momo’s Secret Base by Kenji Tsuruta</figcaption></figure>

Oh, and she’s not actually alone: always underfoot is Grandpa John, a mysterious cat who stowed away on the ship and has become Momo’s sole companion. She considers him the ship’s first officer, though how useful he is in the role is debatable.

Captain Momo’s Secret Base is a fun little manga volume by Kenji Tsuruta, which, according to his postscript, was created over the span of a dozen years for a magazine called Rakuen three times a year in eight-page installments. Tsuruta refers to it as a hitahita manga, with hitahita translating roughly to the sound of waves lapping against the shore, just enough water to submerge an object, or something done in short order. All of these translations kind of work in describing the manga. While its short chapters are easy to read through, the story (as much of one as there is) takes its time, as does Momo herself. Yes, there’s the possibility of her running out of oxygen, of the ship not having enough power for the trip, but neither Tsuruta, Momo, nor Grandpa John is all that bothered by it, nor are they in any hurry to fix the problem. The art has a fresh, loose feeling to it, as though it were casually made whenever Tsuruta had the time to spare between other projects, and it’s written and drawn with a lot of humor.

<figure>
<source type="image/webp" />Captain Momo stands in her cabin wearing an unbuttoned uniform shirt but otherwise nude, listening to a stern transmission from her corporate boss. Multiple screens surround her with company directives to power down ship systems and conserve resources. Momo looks frustrated as the orders emphasize profit over safety.
<svg class="lucide lucide-refresh-cw" fill="none" height="20" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" viewBox="0 0 24 24" width="20" xmlns="http://www.w3.org/2000/svg"><path d="M3 12a9 9 0 0 1 9-9 9.75 9.75 0 0 1 6.74 2.74L21 8"></path><path d="M21 3v5h-5"></path><path d="M21 12a9 9 0 0 1-9 9 9.75 9.75 0 0 1-6.74-2.74L3 16"></path><path d="M8 16H3v5"></path></svg>
<svg class="lucide lucide-maximize2 lucide-maximize-2" fill="none" height="20" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" viewBox="0 0 24 24" width="20" xmlns="http://www.w3.org/2000/svg"><polyline points="15 3 21 3 21 9"></polyline><polyline points="9 21 3 21 3 15"></polyline><line x1="21" x2="14" y1="3" y2="10"></line><line x1="3" x2="10" y1="21" y2="14"></line></svg>
<figcaption class="image-caption">Momo receives corporate instructions to cut power and conserve resources aboard the Blue Chateau | Captain Momo’s Secret Base by Kenji Tsuruta</figcaption></figure>

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Captain Momo’s Secret Base (2023) manga review

Captain Momo’s Secret Base (2023) manga review

Brett Marcella