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The battle of the clone girls unfolds on a post-apocalyptic Earth, devastated by the alien life form known as "Bleed." Pilot the manned weapon "Father" to eliminate enemies. Upgrade weapons, create powerful builds, and strategize to successfully clear stages.
Price history tracked since Jul 7, 2026 · vs all tracked offers.
Based solely on tracked price history — not purchase advice.
Tracked since Jul 7, 2026.
Steam Train Fest starts Jul 20, 2026
Official stores with direct support.
A long time ago, an unknown meteorite came to earth. The meteorite was sleeping quietly deep in the earth, waiting for the time to wake up.
10,000 years have passed, and when humans have built civilization, a change occurs in the meteorite.
Countless alien "breeds" are born from the meteorite and quickly devour the planet.
The true identity of the meteorite was the egg of an alien life form.
The land above is destroyed, and national functions disappear. Humanity is defeated.
Those left behind are forced to live in sturdy underground shelters.
The shelter was named "Ark" and became humanity's last stronghold.
In order to take back the land, humanity has gathered its wisdom and materials and developed two "anti-bleed" combat weapons.
One is the manned weapon “Father”
One is a combat clone soldier with the appearance of a girl who becomes Father's pilot.
They live in a deserted front-line base and then go off to fight.
9th Sentinel Sisters is a casual action game with roguelite elements. You can easily and easily enjoy the exhilarating feeling of wiping out aliens in a desolate near-future atmosphere.
・Create your own build with 16 types of weapons and 37 types of reinforcement parts!
You can experience the exhilarating feeling of defeating a large number of approaching aliens with powerful weapons such as lasers, drills, and missiles.
・Decide the strategy route
Whether you want to take on strong enemies, strengthen your weapons, or recover damage, assess the situation and aim to clear the game!
・The mission for each stage is simple
You can concentrate and enjoy it in a short period of time.
・Choose a hero and enjoy various strategies.
Roguelite casual action
Side view Twin stick
A post-apocalyptic world destroyed by aliens and a fighting girl
16 types of weapons
37 types of reinforced parts
6 heroes
Full controller
Lowest tracked price: CA$4.19 (Jul 7, 2026) · current best: CA$10.49.
70% positive reviews all-time · 2 peak players in the last 30 days.
Right now the cheapest offer for 9th Sentinel Sisters is CA$10.49 at Steam. KingsPrice compares 1 offers from 1 stores — official stores and keyshops — and refreshes prices throughout the day.
The lowest price KingsPrice has tracked for 9th Sentinel Sisters is CA$4.19 (recorded on Jul 7, 2026). This covers the stores and period we monitor — set a price alert to catch the next drop to that level.
9th Sentinel Sisters peaked at 2 concurrent players on Steam in the last 30 days (highest on Jul 9, 2026). The player chart on this page updates daily.
Create a free price alert on this page and KingsPrice will email you when 9th Sentinel Sisters drops below your chosen price. The biggest discounts usually appear during seasonal Steam sales and publisher promotions — the sale calendar on this page shows the next confirmed event.
