Sinful Summer: A Tale of Forbidden Love [Ruykiru] [Ch.3.5]
Description
Embark on an unforgettable journey with Erik and Lyna, two young twins entangled in a passionate web of desires. Set against the breathtaking backdrop of a private tropical island villa, their reunion after a year abroad sparks a fiery exploration of emotions that defy traditional boundaries.
As they tread the line between repressed feelings and mutual attraction, their bond deepens and the craving for the forbidden becomes impossible to ignore. With the arrival of their mother Helga on the horizon, will they succumb to temptation or resist the call of their primal urges? Discover the twists and turns of this compelling narrative through a kinetic visual novel where love, family, and desire intertwine in very interesting ways...
This game has a heavy focus on the incest taboo itself and making the family relationships actually matter and mean something more than just a label. A lot of attention is paid to sound effects, music, descriptive narration and unique angles to enhance both the story and the sex scenes.
Info
- Date
- 6/March/2026
- Name
- Sinful Summer: A Tale of Forbidden Love
- Version
- Ch.3.5
- Incest Content
- Mother-Son, Brother-Sister
- Dev
- Ruykiru
- Android
- Official
Changelog
6/March/2026 - Updated to Ch.3.5
Chapter 3.5
- Story continued: +614 new renders, +16 animations
- H-Scenes: +1 mom-son-daughter (extremely long!)
- General improvements:
- Nothing of note. But as a sneak peak, I'll mention that update 3.6 will be a very long and awaited lesbian scene, update 3.7 will have a big story event and a really special mom-son moment, and 3.8 will be the climax of the chapter.
(29/Nov/2025)
Chapter 3.4
- Story continued: +640 new renders, +55 animations (total of 7 minutes of animated scenes!)
- H-Scenes: +1 mom-son-daughter (long), +1 mom-daughter (very long!), +2 bro-sis
- General improvements:
- Upgraded Helga and Erik character models
- Fixed gallery unlock button logic: becomes "unlock all" whenever you're missing at least one (in new updates for example)
- Optimized code (most saves broke, sorry! use the chapter select)
- Remade options menu; much better clarity.
(23/Sep/2025)
Chapter 3.3
- Story continued: +363 new renders, +27 animations, +5 songs
- H-Scenes: +1 mom-son (very long!), +1 bro-sis
- General improvements:
- Added "Unlock All" button to the scene gallery.
- Updated Helga's skin textures for the body, face and nipples. She looks more MILFy now
- Improved character lighting for the new scenes, Sinful Summer has never looked better!
- Changed rendering method for the new animations, they are true 60fps now!
- Replaced itch.io link in the main menu with f95zone link after my account was deleted. Fuck censorship!
(31/May/2025)
Chapter 3.2
- Story continued: +460 new renders, +7 animations, +9 songs
- H-Scenes: +1 mom-daughter (main focus, very long!), +1 mom-son-dau
- General improvements:
- Added the transitions skip setting to the options.
- Changed the dialogue font to be more readable.
- Fixed display issues for the gallery in all versions.
- Reworked use of italics and quotes.
- Erik is no longer British (he doesn't say "Mum" anymore lol)
(27/Apr/2025)
Chapter 3.1:
- Story continued: +400 new renders, +14 animations, +7 songs
- H-Scenes: +1 mom-son (main focus, very long!), +1 bro-sis
- General improvements:
- Added the accessibility settings menu to the options.
(15/February/2025)
Chapter 2.7
- Conclusion of Chapter 2.
- Story continued: +858 new renders, +40 animations, +9 songs including 1 new music video with custom lyrics
- H-Scenes: +3 bro-sis (one is long awaited one!), +3 mom-daughter, +1 mom-son-dau. (Don't worry, mom-son will get plenty in Chapter 3)
- Enhanced the flow of the story in chapter 1 and up to chapter 2.6:
- Total narrator lines went down drastically 1100 -> ~550! Some were very unnecessary with the visuals on screen, and I'm only keeping most now to enhance the erotic scenes.
- More focus on thoughts and new dialogues. For example, Erik is the one introducing the family now.
- Reduced the length of some monologues and made some dialogues a bit more natural/casual.
- General improvements:
- Remade 140 renders and 2 animations for day 1-2 of the story.
- Completely remastered 35 music tracks from the original soundtrack, including the ones with custom vocals.
- Normalized all sounds to try to reduce the ones that were too loud or quiet. Stick to my recommended audio range and adjust your device as needed.
- Optimized file size and format for all versions (normal, android, superHD). Version 2.7 has better quality than 2.6 but similar size!
- Important change for Android version (2.7.1): saves are now external, and kept on the device even after uninstalling. Find them inside "Documents->RenPy_Saves" (also allow file permission on 1st start of the app for this).
(16/November/2024)
Chapter 2.6
- Story continued: +574 new renders, +11 songs
- H-Scenes: +1 bro-sis (very long!), +1 for mom-son, +1 mom-daughter, +1 mom-son-dau
- Removed +100 lines from the narrator during many scenes of early chapter 1. Replaced with either nothing, or new thoughts/dialogues. Reason: "show, don't tell" (Expect more tweaks/reworks for chapter 1 in the future, because I was still a noob back then, sorry :3)
(11/October/2024)
Chapter 2.5
- Story continued: +820 new renders, +9 animations, +6 songs
- H-Scenes: +1 for mom-son, +1 mom-daughter, +1 bro-sis, +1 mom-son-dau, +big time skip (with lots of teasing!)
- Added a chapter selection option after clicking 'Start'. In case you got issues with saves or need a fast skip.
- Added the 'Jukebox' to the main menu to listen to all the tracks from the game.
- Added the changelog tab to the menu, with all the version change notes.
- Improved the official Android version with swipe gestures and a better interface.
- Scene replay gallery has an infinite scrollbar now instead of numbered pages, and it is sorted by version.
- Rewrote the chapter 2.3 phone conversation with Lyna's friend (much shorter and Lyna doesn't fully reveal the forbidden relationship with Erik).
(16/August/2024)
Chapter 2.4
- Day 12 & 13 of the story: +573 new renders, +7 animations, +7 songs
- H-Scenes: +2 for mom-son, +1 mom-daughter, +2 bro-sis.
- Added a "fantasize" button that appears sometimes for bonus renders. Only for some NEW scenes from now on.
- Made text outlines a bit thicker for improved readability.
4/Sept/2024 - Updated to Ch. 2.4
- Day 12 & 13 of the story: +573 new renders, +7 animations, +7 songs
- H-Scenes: +3 for mom-son, +1 mom-daughter, +2 bro-sis.
- Added a "fantasize" button that appears sometimes for bonus renders. Only for some NEW scenes from now on.
- Made text outlines a bit thicker for improved readability.
Overview
From what the dev says what it looks like...I think it is an extremely promising game, no censor and such. Quite new(First Version on Feb 2024), decent content per update. Expect blueballs.
Content: 2900+ Images, ~58 Animations total for Ch 2.3
Gameplay
Straightforward VN.
Downloads
Sinful Summer: A Tale of Forbidden Love Ch.3.5

Windows/Linux

Windows/Linux(Compressed 85Q)
Android
Screenshots
Gallery
Android Port Info
Android Port Info
1 Save Location
It always is in Documents/INCG_Saves/incg.[gamename]
This folder has a /game folder that works like a PC game folder, you can add ugu.rpy (Universal Gallery Unlocker) and 0x52 Universal Mod, rpa files, patches etc.
If you can't find it in INCG_Saves, I did a cock up and it will be in Documents/Renpy_Saves folder.
Note: This does not apply to official apks, they usually don't have external save location, some do (e.g The Inn). If something asks for external file permission when u first launch it, it should support external save, most of them live in Documents folder.
2 Dialogue Box has weird text ?
Check if it is a port that has INCG Menu, if it exists, there is high chance that switching between Multi-Sayer/Scrolling TB will fix it.
Otherwise you can report it and I'll try fixing it or give up :P.
3 Android Install, Google Play Protect and Other app police like Xiaomi Security/ Anti Virus etcs
Google play protect sometimes triggers, turn it off or just ignore it and install, it will work.
The reason is that my ports asks for storage permission for external Document folder save, to not trigger it, I have to remove that feature, which is not ok, so there is no way around it.
One other option is playing online, which I now offer in the Play section. This costs somewhat a bit, so I can only keep popular games there.
If Online version is available, there will be link to it in the post.
4 IncgWT, IncgCheats, IncgUnlocks !?
Walkthroughs I make are usually shitty, Cheats a bit more useful than my Walkthroughs. Gallery Unlock - most useful and predictable at the moment.
Doing incest patches is planned but unsure.
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