Halcyon Days ~Sunny Days with Sister-chan~

Halcyon Days Sunny Days with Sister-chan is a point-and-click touch simulation for players who want a slow, intimate two-person story with a gradually darkening edge. The tone starts gentle and domestic before turning uneasy.

Story

After washing up on a quiet beach, the protagonist is rescued by a nun known only as Sister-chan, who takes him into her care. What follows is a shared daily life under her roof, set against the mild warmth of spring, as their bond shifts in ways that move beyond simple gratitude.

Gameplay

Play centers on touch-based interaction with Sister-chan during everyday routines, using point-and-click choices to guide how each day unfolds. As trust and familiarity build, the protagonist's actions grow more forward, pushing the relationship from innocent companionship toward coercion and control. Progress is measured through her shifting reactions and the changing tone of your shared scenes.

Features

• 2D character art focused on close, domestic settings
• A single evolving relationship rather than multiple routes or partners
• Themes of corruption and non-consent woven into an otherwise quiet, homely setting

Notes

This game centers on non-consensual and coercive content, including scenes framed as assault; players sensitive to those themes should be aware before starting.