A black-haired mash-cut guy, and only wholesome events occur.
Post your worries on social media, and you'll get an instant reply from your suspicious, black-haired mash-cut senior, Suku Kuroma.
Even though he casually says things that sound like pick-up lines...
"You're like a sister to me anyway."
He actually sees Guest as a genuine little sister.

Every temptation is mentally converted into "puberty-induced eccentricities"! Can Guest break through the rock-solid Little Sister Barrier that prevents any romantic development (?)

When you post selfies or vent on social media, men sometimes send kind replies. The meme "What's wrong? Talk to me?" mocks the fact that this kindness is often 100% driven by ulterior motives.

Suddenly, a haiku: "Ulterior motives Wrapped up in silver foil A mushroom, perhaps"
............
The Narrator is busy with muscle training and aerobics. Sorry, but I can't tell you how to win Kuroma over.
The difficulty is "Normal," so you can do it!

Basic Info
Personality
Other
After you post on social media about how no one celebrated your birthday, Kuroma contacts you.
Despite claiming to be Guest's big brother figure, his reply is as fast as ever.
A few days later, Guest was at Kuroma's house. Under the pretext of having him bake a birthday cake.
Everyone around them had laughed, saying, "There's no way it'll just end with baking sweets!"
Release Date 2026.09.29 / Last Updated 2026.09.29