Story: Laura remembers her past during the Tekken Bloodline event in the event of Tekken 3 where she first met with Jin and fell in a crush with him) And she and her friends of Jin help Jin to train before participating the tournament in Cusco, Peru, South America at Union Academy was invited by Heihachi. And the reason why Wiess said, that Union Academy Union except Jin allowed to mix up in any King of Iron Fist Tournaments because last time in both previous tourneament 1 and 2 were Younger headmasters before became headmaster of Union Academy were defeated by powerful fighters 

Flashback memories during the Tekken Bloodline series

Jin (in the Tekken bloodline event after he lost his mother Jun against the Ogre and as the third year of Union Academy before he left after he became Devil Jin at the end of the Tekken bloodline)

Devil Jin (Jin Kazama's true form)

Heihachi Mishima

Hwoarang

Ling Xiaoyu (Luara's arch rival for Jin's affection and the friend with Class 1A girls and Houki, and Lingying)

Paul Phoenix (Issei's big fan)

Julia Chang

Nina Williams

Ganryu

Leroy Smith

King

Ogre

Dr. Bosconovitch (on the monitor to inform Heihachi during Tekken Bloodline)

Minor appearance:

Marshal Law

Anna William

Steve Fox (Xuelan first love interest)

Graig Marduk

Kuma

Yoshimitsu

Feng Wei

Lei Wulong

Jin Kazama's friend (main)

Ichika Orimura

Laura (she is first love interest with Jin during their meeting after the EXAM while Jin is the third year)

Houki

Cecilia

Charolette

Tatenashi

Lingying

Class 1A

Izuku

RWBY

JNPR

Rias and her peerage (Issei is still fan of Paul Phoenix)

Jin's Allies

Sona and her peerage (Saji also the fan with Marshall Law)

Roswiesse

Ravel (part of Riser's peerage and she remain vigilant)

SSSN

CFVY

Shinji

Rei

Naofumi and his party

Basara and his girlsfriends

Jin Toujou

Chisato

Azazel

Michael

Gabriel

Serafall

Misato

Sieg

Jeanne

Astolfo

Union Academy:

Headmasters: (Headmaster remember Jin, in the their memories during the event of Tekken Bloodline part of Tekken 3, were Heihachi introduce Jin to Headmaster, they know Heihachi back in both tournament when they were young)

Ozpin

Sirzech

All Might

Nezu

Chifuyu

Ironwoods

Gendo

Maria

Satsuki

Union elites:
Satsuki Elite 4

Union Academy Student:

CDRL

Shinji and Rei's friends

Riser and her peerage

Class 1B

Ryuko Matoi

Characters of MHA

Characters Senran Kagura

Characters of Naruto

Characters Akame Ga Kill

MHA characters PRO HEroes

Characters Fate/Apocrypha

Characters of Fate Grand Order

A/N: JeymisPiexoto so far the Tekken 8 season 1 Heihachi Mishima and autumn story mode will be release by fall of autumn. So this story focus on the Laura's memories during the event of Tekken Bloodline as part of tekken 3, can you make prequel story of Tekken Bloodline x Union Academy crossover pls?