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Halcyon Days ~Sunny Days with Sister-chan~ v1.0.4

by CatNight

You wash up on a quiet beach, barely conscious, only to be found and taken in by a kind-hearted nun known only as Sister-chan. This is a cohabitation touch simulation game that gently unfolds your daily life together under the warmth of spring.

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RPGMVZ

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UPDATED ON

May 21, 2026

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VOICED

UNCENSORED

Halcyon Days ~sunny Days With Sister Chan~ (1)

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Halcyon Days ~Sunny Days with Sister-chan~ APK Android Adult Hentai Game Latest Version Download

You wash up on a quiet beach, barely conscious, only to be found and taken in by a kind-hearted nun known only as Sister-chan.
This is a cohabitation touch simulation game that gently unfolds your daily life together under the warmth of spring.

Release Date: 2025-09-14
Original Name: Halcyon Days ~シスターちゃんと陽だまりの日々~
Developer: CatNight Ci-en – DLsite
Translator: ripno
Censored: Yes (Mosaics)
Version: 1.0.4
OS: Windows
Language: English (GLM-5)
Store: DLsite
Genre: 2DCG, Anal Sex, Censored, Corruption, Creampie, Groping, Internal view, Japanese Game, Male Domination, Male Protagonist, Masturbation, Oral Sex, Point & Click, non-consensual-act, Religion, Romance, Sexual Harassment, Sleep Sex, Teasing, Trainer, Vaginal sex, Virgin

v1.0.4

Fixed issue where relationship with Sister-chan would become extremely negative when going to town

【Bugs and Issues Under Investigation】

Unable to perform insertion during the second non-consensual assault
creampie not counted when reaching climax simultaneously
Reverts back to calling “older brother”
We apologize for the inconvenience.

v1.0.3

Fixed ending not triggering
Fixed fewer choices appearing when climaxing simultaneously from behind
Fixed Sister-chan remaining asleep
Fixed remaining asleep when starting touching via “invite to H”

v1.0.2

Fixed receptivity being locked at 100
Fixed incorrect messages when walking in town
Fixed items being usable multiple times
Fixed 20,000-yen items not working correctly
Fixed Mamushi Drink not being released
Fixed character becoming depressed when inviting to H
Fixed insertion gauge not moving
Fixed unexpected messages during touch movement
Added wait time to touching to prevent crashes from rapid input

v1.0.1

Fixed screen darkening and progression halt when selecting “time to go home” on a day off
Fixed ending replaying after waking up in the morning
Fixed vaginal ejaculation count not increasing beyond one in erotic scenes

v1.0
Initial Release

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Install the APK and Open
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file_open Halcyon Days ~Sunny Days with Sister-chan~ Walkthrough

Halcyon Days ~Sunny Days with Sister-chan~ v1.0.4

Halcyon Days APK v1.0.4 Android Adult Hentai Game

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FAQ

How to download

Click the download button above, and you will be redirected to the download page. Click "DOWNLOAD APK," you will redirect to skiplinks and wait for 5 seconds, then click the "Skip Ad" button at the top right corner. You will be redirected to a cloud storage website — just click the download button there, and the file will start downloading. Wait for the file to finish saving to your device.

How to install

After downloading, open the APK file and follow the on-screen instructions to install. If your device shows a warning like "Unknown developer" or "Install blocked," simply tap "Install anyway" or "Allow." You may also need to enable "Install from unknown sources" in your device settings.

How to find saves

Saves are only available on our new ports. Just tap the three dots in the top-left corner and select "Export Saves". The saves file is in Download folder

How to use my save from pc

Use our RPGM Converter: for RPGMV and for RPGMZ After converting, just open the game, tap the three dots in the top-left corner, and select Import.

Blacksreen on start

Just tap the screen at the left top corner.

How to know game package name

I recommend installing ES File Manager. Tap the .apk file, and you’ll see information about the APK, including the package name.

Disclaimer

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