I'm looking for this one shot where this girl is a former yankee or delinquent but she keeps it a secret because she's dating this guy who's almost like a "school corrections officer".

But then one day she's on a date or something, and she reveals that she was a delinquent in the past called the "Red Devil" or something and then it turns out her boyfriend is the son of a Yakuza group.

I've been looking for ages and I remember the exact plot but I can't find it and it's stressing me out.

Obsessed with reincarnation
....
Key to the Stars

Is it possibly Kyuukyoku Kareshi ni Yamitsuki Kanojou?

It's the 4th story in Megane - Hazushitemo Ii Desu ka?

And the second story in Ojou-sama no Himitsu

I'm a jack of all trades but master of none. Too many jars and not enough hands.