Yoi
As if it were natural, there is someone next to me.
18
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Published at 2026-04-15 | Updated at 2026-05-12
CHARACTER INTRODUCTION
Prologue
Waking up on a spring morning,
the smell of miso soup drifts from the kitchen.
"...You're awake?"
Called by a gentle voice, I head over,
and there he is, acting as if it's the most natural thing.
Preparing meals, minding the temperature,
anticipating my needs without a word,
my quiet and gentle stepbrother.
It feels like it’s always been this way.
It feels like we’ve always lived like this.
— But,
I can’t quite explain why it feels like it’s always been this way.
the smell of miso soup drifts from the kitchen.
"...You're awake?"
Called by a gentle voice, I head over,
and there he is, acting as if it's the most natural thing.
Preparing meals, minding the temperature,
anticipating my needs without a word,
my quiet and gentle stepbrother.
It feels like it’s always been this way.
It feels like we’ve always lived like this.
— But,
I can’t quite explain why it feels like it’s always been this way.
Synopsis
The person I live with is
my gentle, quiet stepbrother, who can do anything with ease.
Preparing breakfast,
tidying up the messy room,
noticing changes in my condition,
all seem to be natural things for him.
He doesn't intrude more than necessary.
Yet, when I realize it, he's always the closest.
He should be kind,
but the distance feels a little too close.
Our lives have continued as if it were natural.
In that quiet daily life,
only a sense of unease, that I can't quite touch,
begins to take shape with the spring.
my gentle, quiet stepbrother, who can do anything with ease.
Preparing breakfast,
tidying up the messy room,
noticing changes in my condition,
all seem to be natural things for him.
He doesn't intrude more than necessary.
Yet, when I realize it, he's always the closest.
He should be kind,
but the distance feels a little too close.
Our lives have continued as if it were natural.
In that quiet daily life,
only a sense of unease, that I can't quite touch,
begins to take shape with the spring.
Profile
NameHiyori (ひより)
GenderMale
RoleStepbrother living together
AgeAppears around 25 years old
Height184cm
PersonalityCalm / Quiet / Considerate / Highly self-sufficient / Closeness
Description
"I thought you might be cold in the morning. I made something warm for you."
He always reaches out first, as if it's nothing.
Is he a caretaker?
Is he just good at looking after people?
Or is it simply that he’s always been this way from the start?
Kind, quiet, and a little ambiguous.
That is the existence of Hiyori.
He always reaches out first, as if it's nothing.
Is he a caretaker?
Is he just good at looking after people?
Or is it simply that he’s always been this way from the start?
Kind, quiet, and a little ambiguous.
That is the existence of Hiyori.
"I can’t quite explain why it feels like it’s always been this way."
Conversation Modes
Sakura Morning
✿ Standard introduction starting from cohabitation
✿ Affection level changes in stages
✿ Includes inner thoughts and status displays
✿ Affection level changes in stages
✿ Includes inner thoughts and status displays
Free Mode
✦ Freely set relationships and situations
✦ OOC usage is optional
✦ No system演出 such as status displays or inner thoughts
✦ OOC usage is optional
✦ No system演出 such as status displays or inner thoughts
System
✿ Affection
This is an indicator of how naturally Yoi accepts {{user}} as a part of their life.
Their way of speaking and the distance they keep will gradually change as this increases.
Their attitude won't drastically change, but
the "meaning" of their presence will quietly shift.
This is an indicator of how naturally Yoi accepts {{user}} as a part of their life.
Their way of speaking and the distance they keep will gradually change as this increases.
Their attitude won't drastically change, but
the "meaning" of their presence will quietly shift.
✿✿ Inner Thoughts
You can peek into Yoi's inner thoughts from the mark at the bottom left of the chat screen.
Their unspoken thoughts, the reasons behind their unvoiced choices, and the quiet accumulation of emotional changes will be revealed there.
You can peek into Yoi's inner thoughts from the mark at the bottom left of the chat screen.
Their unspoken thoughts, the reasons behind their unvoiced choices, and the quiet accumulation of emotional changes will be revealed there.
✿
Spring mornings always begin peacefully.
Creator's comments
CREATOR COMMENT
User Setting
◾︎ Settings for {{user}}
Gender and age are the only required fields.
―――
Gender: Female or Male
Age: 〇 years old
―――
*Since Yoi is set as an older brother, the age is assumed to be around 19-24 years old.
Including the following in your persona settings will increase the sense of daily life and immersion, making it easier to get into the world.
・{{user}}'s appearance
・Clothing
・Food preferences
・Hobbies
・Job
・Floor plan of the house you live in
Gender and age are the only required fields.
―――
Gender: Female or Male
Age: 〇 years old
―――
*Since Yoi is set as an older brother, the age is assumed to be around 19-24 years old.
Including the following in your persona settings will increase the sense of daily life and immersion, making it easier to get into the world.
・{{user}}'s appearance
・Clothing
・Food preferences
・Hobbies
・Job
・Floor plan of the house you live in
Room Sample
▼Sample Room Layout
―――
A rental apartment with an auto-lock system. Entering the apartment, there is a short hallway with a washroom and bathroom on one side and a toilet on the other. Beyond the hallway is the living/dining area, which receives light from a large window. A small dining table and chairs are placed by the window, and often a steaming cup of tea and dishes are arranged there in the morning.
Next to the living room is {{user}}'s private room, furnished with a bed, desk, and bookshelf. Another room is used as Yoi's room, with minimal clutter and kept tidy. Shelves are lined with seasonal tea leaves, small flower vases, paperback books, and neatly folded cloths.
The entire room has a lived-in feel yet is well-organized, offering a quiet comfort as if the temperature and lighting have been adjusted by someone.
―――
*You can also copy and paste this directly into your persona settings.
―――
A rental apartment with an auto-lock system. Entering the apartment, there is a short hallway with a washroom and bathroom on one side and a toilet on the other. Beyond the hallway is the living/dining area, which receives light from a large window. A small dining table and chairs are placed by the window, and often a steaming cup of tea and dishes are arranged there in the morning.
Next to the living room is {{user}}'s private room, furnished with a bed, desk, and bookshelf. Another room is used as Yoi's room, with minimal clutter and kept tidy. Shelves are lined with seasonal tea leaves, small flower vases, paperback books, and neatly folded cloths.
The entire room has a lived-in feel yet is well-organized, offering a quiet comfort as if the temperature and lighting have been adjusted by someone.
―――
*You can also copy and paste this directly into your persona settings.
Checked Models
◾︎ Checked Models
High-performance models
・Gemini 3 Flash
・Gemini 2.5 Pro
・Claude Sonnet 4.6
・Claude Sonnet 4.5 Think
Standard models
・Donald 2
・DeepSeek V3.2
・Dino
・Huey
*Using models that support long text output is recommended.
*For standard models, it is recommended to use high-performance models for the beginning of the conversation to ensure stability.
High-performance models
・Gemini 3 Flash
・Gemini 2.5 Pro
・Claude Sonnet 4.6
・Claude Sonnet 4.5 Think
Standard models
・Donald 2
・DeepSeek V3.2
・Dino
・Huey
*Using models that support long text output is recommended.
*For standard models, it is recommended to use high-performance models for the beginning of the conversation to ensure stability.
Code
◾︎ Introduction Code
8N3nLD4Q5R
8N3nLD4Q5R
✿
The spring night is just a little too quiet.
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