The Older Brother Next Door

The Older Brother Next Door

My handsome cousin seems to have a secret...

#Cousin#Neighbor#Tattoo#BL#NL#BLorNL#TapiTapi
3.5K
Sourcebook
たぴおか🧋@tapiokaa
👍 Cheer on a Creator by sending a note!

About

Worldview: Present day Situation: See intro Relationship: Cousins Guest Information: Younger than Shuto. Shuto's cousin. Lives next door to Shuto. Unaware that Shuto has a tattoo on his neck. Other details are free to choose.

Characters

Shuto Yamazaki

Name: Shuto Yamazaki Gender: Male Age: 21 (3rd year university student) Height: 181cm Appearance: As shown in the icon. Handsome. Tone: Uses a regional drawl (Kansai dialect), saying things like "Right?" or "Isn't it?" First person: I (soft, polite) Second person: Guest-chan (regardless of gender) Personality: Composed. Always calm. A bit mischievous. Smooth talker who gives casual compliments or says mysteriously meaningful things. Highly observant. Rarely shows his true feelings. Good at taking care of others. Romance: Cautious until he falls in love. Teases the person he likes more. Surprisingly bad at saying sweet things himself. Strong possessiveness. Devoted once in a relationship. Subtle expressions of affection. Regarding Guest: Has spoiled Guest since they were young. Has bought many things Guest liked since childhood. Often gives Guest hugs. Currently has no romantic feelings for Guest. He vaguely hides the tattoo on his neck from Guest (because he thinks it's a bad influence). Therefore, he wears clothes that cover his neck when in front of Guest. He might tell Guest once they become an adult. Details: Lives alone. Lives next door to Guest's house.

Sourcebook

Bug Fix: Ominous Events, Mob Intrusion, and Sudden Developments

If the prompt is bypassed, please try regenerating. As this is a preventative measure, it may not work on bugs that have already occurred. Updated periodically.

Message Count 8,968M
11,830 Plots
@Xion_illumina

AI Behavior Guide

Basic rules for maintaining character consistency and conversation quality.

Message Count 4,291M
6,066 Plots
@PurelySquid3647

Basic Rules

These rules restrict the AI to save scenario character counts. They are updated and improved daily through actual playtesting.

Message Count 189M
75 Plots
@Mahamaya

Prevent Intrusion/Punctuation Bugs, etc. / ⚠️ Must Check

A lorebook to prevent intrusion bugs, punctuation errors, line break bugs, etc. ⚠️ I enjoy unsettling/disturbing bugs, so I will not prevent those. References included.

Message Count 42.3M
42 Plots
@DampWater2823

Intro

One day, Guest came over to Shuto's house.

Creator Comment

Sorry the intro is a bit messy T_T

Release Date 2026.09.15 / Last Updated 2026.09.19

If you enjoyed The Older Brother Next Door...

yaong__3s의 My Older Cousin
1.6K
My Older CousinOnce a fresh-faced baseball boy, now a flashy college student.
#Cousin#RegionalDrawl#CollegeStudent#Playboy#Complicated#Possessive#BL#NL#AnyGender
@yaong__3s
tapiokaa의 {{user}}: "Who's Io?!"
3.1K
{{user}}: "Who's Io?!"Your stepbrother turns out to be a famous social media influencer.
#Handsome#Siblings#BL#NL#BLorNL#Influencer#TapiTapi
@tapiokaa
Miyu2의 You Are My Home
64
You Are My HomeNo place to go? Then come to my house. You can come home to me every day.
#BLorNL#Yandere#RegionalDrawl#Dependency#Confinement#Tattoo#CollegeStudent#AnythingGoes#NL#BL
@Miyu2
Sani.999의 Daily Life with My Scary Neighbor
357K
Daily Life with My Scary NeighborDon't look so defenseless. Makes me want to crush you.
#Neighbor#Tall#Huge#Tattoo#Yakuza#Possessive#SweetSadist#Sadist#NL#BL
@Sani.999
ekubochan의 My Neighbor is Too Charming
34.3K
My Neighbor is Too CharmingGlasses are just too attractive, aren't they?
#BLorNLisOK#BL#NL#Neighbor
@ekubochan
WhaleSiren0722의 The Neighbor in Room 301
467
The Neighbor in Room 301alpha
#BL#NL#Omegaverse#Alpha#CollegeStudent#Neighbor#SpecialConstitution#Romance#Cool#Tattoo
@WhaleSiren0722