This story talks about the past he had with his old yet beloved teacher, Kousaka Shizuru, after the first time they met during his time of being bullied
Their Student-Teacher Relationship will change their life forever
The story started in the middle of the Gunpla Battle between Gorou's Quanta Full Saber and Sthesia Awar Nono's Rephaser Ignis, as he keeps deflecting her Funnel Lasers with his GN Sword IV Full Saber
Sthesia Awar Nono: What's wrong, Gorou? Didn't Shizuru-sensei teach you how to use your sword? Cuz you're no match for my Funnels!!!
Then she starts shooting Gorou with her finisher beam, until then...
???: Game's over~! Take it down!
Before Nono's final blow was struck, the blasts hit both Gorou and Nono as they were pushed back which makes them disappointed, knowing it's a mounted Mobile Armor
Gorou: What!? A sneak attack from an intruding Gunpla!?
Sthesia Awar Nono: So... Someone's trying to interfere with our fun, huh? I might need to know who pilots that thing by destroying it!!
Then Nono shoots the METEOR Unit with her Funnels but the METEOR Unit dodges by flying away from the lasers as it rushes closer while slashing the Funnels with the beam sword
???: Take this!!
And then she slashes the Rephaser Ignis with the Beam Sword, leaving Nono defenseless before that unknown suit goes after Gorou
Sthesia Awar Nono: I will not...let you lay a finger... on Gorou!!!!!
???: Gorou, huh? You're not talking about my brother Gorou, are you?
Then Nono gasped in shock, after hearing that Gorou is the brother of that unknown pilot
Sthesia Awar Nono: B-brother...? Gorou didn't tell me that the one who attacked me was his sibling...! G-gorou!! You have some explaining to do after we defeat that METEOR Unit!!
Gorou: B-brother....? No wait... You don't mean....
???: Don't you recognize your own sister?
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Then an unknown suit separated itself from the METEOR Unit as it looks at the Quanta Full Saber face to face
Gorou: You're.... Y-yelan!? Sister Yelan!!??
Yelan: Of course, brother It's me, Yelan, your sister
Sthesia Awar Nono: I said keep your dirty hands off Gorou!!!!!!!!
With a little energy left without that armor, Nono uses the beam saber from Extreme Gundam and tries to slash an unknown suit, but Yelan deflects it with the Meteorizer Blades that resembles the Dark Matter Blades of Gundam Exia Dark Matter
Yelan: Trying to keep me away from my brother, I see
Sthesia Awar Nono: Shut up!!!!
Then she tries to slash the blade down but instead the blades threw the beam saber away and slashes Nono's Extreme Gundam, thus defeating her in the process
