Sekai Project games
Sekai Project is a publisher closely associated with Japanese visual novels and anime-styled indie titles brought to PC audiences in English. Its catalogue ranges from romance and slice-of-life storytelling to action platforming and mech combat.
The selection covers the NEKOPARA series, Rabi-Ribi, M.A.S.S. Builder, Serment Contract with a Devil and more, all for Steam.
Sekai Project
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Nie No Hakoniwa – Dollhouse of Offerings Steam Digital Key
STEAM KEY • GLOBAL$28.88
$0.89
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NEKOPARA Vol. 3 Steam Altergift
STEAM ALTERGIFT • GLOBAL$23.10
$14.05
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Mahou Arms EU Steam Altergift
STEAM ALTERGIFT • EUROPE$40.21
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Mahou Arms Steam Altergift
STEAM ALTERGIFT • GLOBAL$40.21
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Rabi-Ribi EU Steam Altergift
STEAM ALTERGIFT • EUROPE$23.10
$10.15
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Rabi-Ribi Steam Altergift
STEAM ALTERGIFT • GLOBAL$23.10
$10.15
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NEKOPARA Vol. 3 Steam Altergift
STEAM ALTERGIFT • GLOBAL$23.10
$14.05
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NEKOPARA Vol. 3 EU Steam Altergift
STEAM ALTERGIFT • EUROPE$23.10
$14.05
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NEKOPARA Vol. 4 Steam Altergift
STEAM ALTERGIFT • GLOBAL$23.10
$10.67
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M.A.S.S. Builder Steam Digital Key (valid until May 2027)
STEAM KEY • GLOBAL$23.10
$4.26
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G-senjou no Maou – The Devil on G-String Voiced Edition Steam Digital Key
STEAM KEY • GLOBAL$28.88
$21.10
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Saku Saku: Love Blooms with the Cherry Blossoms Steam Digital Key
STEAM KEY • GLOBAL$23.10
$9.15
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Rabi-Ribi Steam Digital Key (valid until April 2027)
STEAM KEY • GLOBAL$23.10
$3.44
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Fatal Twelve Steam Digital Key
STEAM KEY • GLOBAL$23.10
$1.69
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NEKOPARA Vol. 1 Steam Digital Key (valid until April 2027)
STEAM KEY • GLOBAL$23.10
$3.63
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M.A.S.S. Builder Steam Digital Key
STEAM KEY • GLOBAL$23.10
$4.09
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My Girlfriend’s Special Place Steam Digital Key
STEAM KEY • GLOBAL$28.88
$1.65
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Nie No Hakoniwa – Dollhouse of Offerings Steam Digital Key (valid until April 2027)
STEAM KEY • GLOBAL$28.88
$0.99
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NEKOPARA Vol. 4 Steam Digital Key (valid until April 2027)
STEAM KEY • GLOBAL$23.10
$3.19
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NEKOPARA Vol. 3 Steam Digital Key (valid until April 2027)
STEAM KEY • GLOBAL$23.10
$2.20
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My Girlfriend’s Special Place Steam Digital Key (valid until April 2027)
STEAM KEY • GLOBAL$28.88
$0.98
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NEKOPARA Vol. 4 Steam Digital Key
STEAM KEY • GLOBAL$23.10
$3.02
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NEKOPARA Vol. 3 Steam Digital Key
STEAM KEY • GLOBAL$23.10
$2.20
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NEKOPARA Extra Steam Digital Key
STEAM KEY • GLOBAL$23.10
$0.83
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KARAKARA2 Steam Digital Key
STEAM KEY • GLOBAL$23.10
$0.88
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NEKOPARA Vol. 1 Steam Digital Key
STEAM KEY • GLOBAL$23.10
$3.98
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NEKO-NIN exHeart Steam Digital Key
STEAM KEY • GLOBAL$23.10
$6.62
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NEKOPARA Vol. 4 EU Steam Altergift
STEAM ALTERGIFT • EUROPE$23.10
$9.22
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NEKOPARA Vol. 4 Steam Altergift
STEAM ALTERGIFT • GLOBAL$23.10
$9.22
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A Magical High School Girl Steam Digital Key
STEAM KEY • GLOBAL$23.10
$3.07
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Sound of Drop – fall into poison – Steam Digital Key
STEAM KEY • GLOBAL$23.10
$2.65
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NEKOPARA Vol. 2 Steam Digital Key
STEAM KEY • GLOBAL$23.10
$2.63
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NEKOPARA Vol. 0 Steam Digital Key
STEAM KEY • GLOBAL$23.10
$1.19
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Memory’s Dogma CODE:01 Steam Digital Key
STEAM KEY • GLOBAL$17.32
$1.98
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Serment Contract with a Devil Steam Digital Key
STEAM KEY • GLOBAL$23.10
$4.16
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Rabi-Ribi Steam Digital Key
STEAM KEY • GLOBAL$23.10
$2.77
About Sekai Project
Sekai Project works with Japanese and independent developers to publish story-led games for PC, and it is best known for the NEKOPARA series from NEKO WORKs. Alongside those visual novels sit titles from studios such as CreSpirit, whose Rabi-Ribi blends action platforming with bullet-heavy boss fights, plus work from Lycoris, feng, Chatte Noire and Vermillion Digital.
The wider line-up leans on adventure, casual and dating simulator styles, with occasional action projects like M.A.S.S. Builder. Most of it falls into the indie games space, made by small teams with a strong visual identity.
Games in the catalogue
The NEKOPARA series is represented across Vol. 0, Vol. 1, Vol. 2, Vol. 3 and Vol. 4, the character-driven visual novels from NEKO WORKs. Other narrative titles include Memory's Dogma CODE:01, Sound of Drop - fall into poison, Nie No Hakoniwa - Dollhouse of Offerings, NEKO-NIN exHeart and My Girlfriend's Special Place.
Beyond the reading-led releases there is Rabi-Ribi for action platforming, Serment Contract with a Devil for dungeon crawling with a light-hearted cast, A Magical High School Girl and the mech builder M.A.S.S. Builder. Releases span 2014 to 2024 and every title here runs on Steam, covering adventure, casual, visual novel and dating simulator tastes.
How buying works
Each of these games activates on Steam, so the code is redeemed in the Steam client or website and the game is then tied to that account. If you have not done it before, the Steam key activation guide walks through the steps. NEKOPARA Vol. 4 may be supplied as a key or as an Altergift, where the title is delivered to your Steam account as a gift rather than as a code you type in.
Games are sold per region, and a key has to match the region of the account it is being activated on, otherwise Steam will refuse it. Check the region of a listing against your account before buying; region locking explained covers how these restrictions work.
Common questions
- Which platform do Sekai Project games activate on?
- Every title in this selection is for Steam. The code is added to a Steam account and the game appears in that account's library.
- Will a key work in another country?
- Only if the key's region matches the region of your Steam account. A key intended for one region will not redeem on an account registered elsewhere, so compare the two before ordering.
- What is an Altergift and how is it different from a key?
- A key is a code you redeem yourself in Steam. An Altergift is delivered to your Steam account as a gift, so you accept it instead of typing in a code. NEKOPARA Vol. 4 can come either way.
- When do I receive my code?
- The key or gift details are delivered to your order once payment completes.
- Do I need to play the NEKOPARA games in order?
- Each volume is sold separately and none of them requires another purchase to activate. You can buy a single volume on its own.