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Completed
v1.0.4
Halcyon Days ~Sunny Days with Sister-chan~
Game Information
Developer
CatnightVersion
v1.0.4
Engine
RPGM
Release Date
Sep 14, 2025
Last Update
May 8, 2026
Censorship
Censored
Overview
Halcyon Days Sunny Days with Sister-chan immerses you in a heartwarming cohabitation experience with Sister-chan, a kind-hearted nun who takes you in after you wash up on her beach.
Gameplay & Mechanics
This dating sim trainer game lets you manage daily life together with Sister-chan, gradually corrupting and training her through various interactions like groping, sleep sex, and more.
Key Features
- Cohabitation Touch Simulation: Experience daily life with Sister-chan in a peaceful beachside setting.
- Gradual Corruption & Training: Interact with Sister-chan to slowly change her attitudes and behaviors.
- Diverse Sexual Activities: Engage in various sexual acts, including anal sex, oral sex, vaginal sex, and creampies.
Download and play Halcyon Days Sunny Days with Sister-chan now on Gaxload.
Installation
1. Extract and run.
Changelog
### 1.0.4
- 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 forced assault
- creampie not counted when reaching climax simultaneously
- Reverts back to calling "older brother"
- We apologize for the inconvenience.
### 1.0.3
- 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"
### 1.0.2
- 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
### 1.0.1
- 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
### 1.0
- v1.0
- Initial Release
- 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 forced assault
- creampie not counted when reaching climax simultaneously
- Reverts back to calling "older brother"
- We apologize for the inconvenience.
### 1.0.3
- 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"
### 1.0.2
- 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
### 1.0.1
- 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
### 1.0
- v1.0
- Initial Release
