Stupid Sister Observation Diary

Synopsis

【GENRE】

A new sensation trap-based erotic SLG where you ensnare your sister in lewd traps for fun.

【STORY】

Right after summer vacation begins, Mom calls from her business trip abroad.

Mom: “Noa-chan, don’t you want to come to Italy for a vacation~?”

Noa: “In 10 days!? Yeah, I’m going! I’m bored being stuck with my stupid brother anyway♪”

(Brother overhears)

Brother: “What…? Noa’s studying abroad in Italy…? (misunderstanding)”

Brother: “This won’t do. I need to take action to keep Noa in Japan until her departure in 10 days…!”

And so the brother devised a plan to stop her using erotic traps.

【GAME EXPLANATION】

During August 1-9, set traps at destinations and chain combos using environmental hazards to raise Noa’s stats—Slut, Pervert, and Exhibitionist—leading up to the final day (10th). Insufficient stat values result in bad endings. True end flags unlock from the second playthrough onward. 5 endings total (including bad ends). 90+ CG images with variations and 40 memory scenes.

【SYSTEM】

●Sister Guidance: Choose dialogue options in breakfast ADV phases to guide Noa to residential, shopping, entertainment, or electronics districts.

●Trap Placement: Set traps on blank spaces during setup phases on each map.

●Automatic Sister Movement: Noa moves forward automatically during her action phase—chain traps together to break her.

●Combo System: Link traps consecutively for combo chains. More combos yield higher attribute gains and AP (Brother Points) at results phase. Special limited events trigger at 6+ same-attribute chains (3 variations per attribute).