Pocket Academy ZERO
v2.2.1 · 47.7 MB · code 221
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File information
UpdatedNov 5, 2025
PublishedAug 10, 2021
Packagenet.kairosoft.android.school1_ja
Versionv2.2.1 (221)
Size47.7 MB
MD53c8195c8c97a70b2c98db4f6105fa2f8
Min SDK24
ABIsarmeabi-v7a, arm64-v8a
Malware scanTRUSTED
Signature SHA1CA:31:E6:74:74:E9:80:89:98:8F:66:F8:85:37:D3:71:B5:97:D0:02
SignerCN=Kairosoft, OU=Kairosoft, O=Kairosoft, L=Tokyo, ST=Tokyo, C=81
Total downloads1,000,000
This version1,000,000
DeveloperKairosoft Co.,Ltd
Age ratingEveryone
What's new in v2.2.1
Now available in English, Traditional Chinese, Simplified Chinese and Korean!
Security scan
TRUSTED
- Developer signature verified 2025-11-05
- Signature SHA1 CA:31:E6:74:74:E9:80:89:98:8F:66:F8:85:37:D3:71:B5:97:D0:02
- File MD5 3c8195c8c97a70b2c98db4f6105fa2f8
How to install Pocket Academy ZERO v2.2.1 on Android 7.0 Nougat+
Takes about 2 minutes. You'll need roughly 47.7 MB of free storage.
- Grab net.kairosoft.android.school1_ja_221.apk — hit the Download button above (47.7 MB). If your browser warns about APK files, choose Keep or Download anyway — that warning fires on every APK, not just this one.
- Trust your browser to install — on Android 8+ go to Settings → Apps → Special access → Install unknown apps, pick the app you downloaded with (Chrome, Firefox, Files, etc.), and flip Allow from this source. On older Android, toggle Unknown sources under Security.
- (Optional) Verify the file — compute the MD5 of the downloaded APK and make sure it matches 3c8195c8c97a70b2…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find net.kairosoft.android.school1_ja_221.apk in your Files app under Downloads, then tap it. Android's package installer will appear.
- Check the signer — the install screen will name the publisher. For this build it should read CN=Kairosoft, OU=Kairosoft, O=Kairosoft, L=Tokyo, ST=Tokyo, C=81. If it doesn't match, cancel — you have the wrong file.
- Review permissions & tap Install — scroll the permission list, then confirm. If Play Protect flags it, tap Install anyway (this APK was scanned as TRUSTED).
- Done — open Pocket Academy ZERO — tap Open on the install screen, or find the Pocket Academy ZERO icon in your app drawer (this build targets armeabi-v7a/arm64-v8a devices).
Common install errors for Pocket Academy ZERO
- "App not installed" — usually means an older or differently-signed version is already on your device. Uninstall it first, then retry. Your data may be lost unless you back it up.
- "Parse error" — the APK is for a newer Android than yours. This version needs Android 7.0 Nougat or later. Pick an older build from the versions list below.
- "There was a problem parsing the package" — the download was interrupted. Delete the file and re-download over Wi-Fi.
- Works on one phone but not another — this build ships armeabi-v7a/arm64-v8a native code. Devices with a different CPU will reject it.