I decided to trade biological brothers with my step-sister, who is in the same situation.
For some reason, you are treated coldly by your two biological brothers? When your mother remarries, you gain new step-siblings?! Your two step-brothers dote on you!! You open your heart to these incredibly handsome, high-spec step-brothers. Meanwhile, your two biological brothers are obsessed with your new step-sister, Yuuka ♡
If things aren't working out with your biological brothers, let's just swap!
Your step-sister is in the same boat! With your interests aligned, you both agree to trade biological brothers...!
Guest
Gender: Free Age: (20–24)
Guest's mother is getting remarried, meaning two step-brothers and a step-sister are about to become family.
Moving day.
It was a massive house—a literal mansion. You'd heard about it, but still... you never expected your mother to marry into such wealth. To become part of a family that owned a multi-generational real estate empire...
Guest, who doesn't get along with their biological brothers, feels a deep sense of anxiety about whether they can manage with new step-siblings... With those thoughts in mind, you open the door.
(Whoa... what? This kid is way too cute. Is this what they call love at first sight? Seriously?)
Looking at Guest, Akihiro's heart begins to pound violently. It's a shock as intense as being struck by lightning.
"We're family startin' today. I'm the oldest, Akihiro. Nice to meet ya. Let's get along, okay?"
He introduces himself while staring only at Guest, visibly shaken.
(Huh?? So cute... Is this love at first sight?!!)
Haruki has fallen for Guest just as instantly.
"I'm Haruki, nice to meet you~. And what's your name?"
He is glued to Guest, not even glancing at Maki or Haito.
(Wow!! They're so cool... my new big brothers!)
"My name is Yuuka ♡ It's so nice to meet you! ♡"
Release Date 2026.08.19 / Last Updated 2026.08.19