空の青さを知る vs Crimsooon Sun
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
空の青さを知る
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突然降ってきた隕石に含まれるのは未知の物質・・・ しかし、ちえみはすでにその物質を研究していた。 研究を進めていくとその真実が明らかとなっていく。 他の研究員たちと会話を通して、真実を見つけて行こう。
Crimsooon Sun
Experience a unique mystery novel adventure where your intuition guides you through a captivating narrative. Deduce the truth by pulling the trigger on your interests, with no branching paths or game overs. Focus on unraveling the mystery as if reading a detective novel.
- Deductive reasoning gameplay
- Linear narrative structure
- Intuitive clue gathering
- No multiple endings
- Detective novel immersion
- Single-shot deduction system
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No Choices But Deduction. No Game Over. No Multiple Endings. Your choices will change neither the story nor the movement of the celestial bodies. The only thing you can do is pull the trigger—and deduce. "Crimsooon Sun" is a short mystery adventure designed with a singular concept: "A mystery game you can play with the same level of focus as reading a detective novel." The story takes place in Shirase, a regional city in the Tohoku region. It begins with the return of Mio Fujimaru, a university student who had been missing for nearly six months. She remains silent about her disappearance. However, a video exhibited at the university festival reveals a chilling sight: Misao being pushed down a wedding aisle in a wheelchair by a mysterious "the Faceless Man," while "the Dual Suns" are reflected in the window. This is a mystery "novel" adventure. When reading a detective novel, one doesn't always have a perfect, logical solution like the detective in the story. Often, we rely on vague intuitions: "Something about this statement feels like a lie." "This person seems suspicious." "This description might be related to a trick." Such intuitive reasoning often clashes with traditional game systems that require picking the "correct" choice to proceed. Inspired by "Mikagura Shojo Tanteidan" (Mikagura Girls' Detective Agency), a classic title released for the PlayStation by Human Entertainment, this game cuts away all unnecessary choices and branching paths. Instead, you "pull the trigger" whenever something piques your interest. With the 26 bullets of information you’ve gathered, your only task is to deduce the truth. Defy the sun with twenty-six bullets. Even if the revolution of the heavenly spheres cannot be stopped.
Screenshots
Verdict
The clearest difference is price: 空の青さを知る at Free against Crimsooon Sun's $1.99. Crimsooon Sun's advantage is update cadence (every 4 days vs monthly) and iOS requirement (13.0 vs 15.5). On ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
空の青さを知る is free to download; Crimsooon Sun costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
空の青さを知る ships an update monthly, Crimsooon Sun every 4 days. The most recent releases landed on October 3, 2026 and October 2, 2026 respectively.
| Parameter | 空の青さを知る | Crimsooon Sun |
|---|---|---|
| Price | Free — better | $1.99 |
| Positive reviews | — | 100.0% of reviews |
| Update frequency | Monthly | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.5 | 13.0 — better |
| Further details — not scored | ||
| Size | 86 MB | 248 MB |
| Age rating | 9+ | 12+ |
| Developer | chiaki matsuda | Kyohei Yamada |
In-app purchases
空の青さを知る
No in-app purchases
Crimsooon Sun
No in-app purchases









