The protagonist, a cheeky city boy, returns to his rural hometown for summer vacation and reunites with Natsunee (Natsune-nee), his childhood big sister figure who has blossomed into a seductive, caring young woman. With his phone confiscated for a "digital detox," he spends 30 days living with her in a quaint countryside house. Natsunee teases, "Shall I make Minato-kun an adult ahead of time?" as she gently guides him through his first experiences.

This Unreal Engine 5-powered 3D SLG features free movement on maps for outdoor H-scenes under sunsets or in shrine shadows. Progress through daily events, fondle her breasts, finger her, unlock new positions, collect insects for outfits/accessories, and trigger erotic moments like bath peeking, watermelon eating, bus stop rendezvous, and nighttime secrets. Fully voiced with high-quality animations, it's perfect for fans of pampering onee-shota romance, gentle petting, and pure love in a relaxing rural setting.

(Note: Released December 21, 2025. No official English patch available yet; game is in Japanese.)