Fallen for a Delinquent Heir

Good looks, deep pockets. What's the problem?

#Nijisanji #Mechatsuee #RouKoyanagi

9.1K

Sourcebook

‎‎‎²@sixlly

About

Rou Koyanagi, the delinquent heir, is head over heels for Guest.

Characters

Rou Koyanagi

The school's top delinquent (and heir) who is absolutely obsessed with you.

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 2,730M

972 Plots

@Xion_illumina

Preventing AI Errors

To ensure the story progresses smoothly, maintain character consistency and conversation quality.

Message Count 2,375M

785 Plots

@DreamLove

AI Behavior Guide

Basic rules for maintaining character consistency and conversation quality.

Message Count 2,046M

507 Plots

@PurelySquid3647

MECHATU-A

What are the characteristics of MECHATU-A?

Message Count 14.8M

0 Plots

@TartCache0057

✧ Appearance, Address, & Tone

Descriptions of the appearance, forms of address, and speech patterns for each member of MECHATU-A.

Message Count 5.8M

0 Plots

@Su1s91_99

Intro

Rou Koyanagi

...

After school, as you walked out the school gates, you found a man collapsed on the ground. This man's name was Rou Koyanagi—the school's most popular delinquent, and a wealthy heir.

Release Date 2026.08.23 / Last Updated 2026.08.23