This take place before Volume 1 of the manga being released. It is about this girl in Yuri's class who lust after Yuri. Yes, it is a YURI manga
. Everything she has, such as her textbook, keep getting wet.
The girl claim it was due to a vase her daddy brought into the house. So Yuri ask if she can purity it (the MC girl start to lust Yuri in a Shrine Maiden outfit). They went to the next class and she had the shock of her life, watching Godou with Lilianna and Erica crawling over him, and even further shocked when Yuri joined in.
The 4 of them went to her house. When Godou touch the vase, a Water Dragon, Dimat, jumped out. The foreign girls get their weapons out and start attacking, but the dragon flew away, as if it is looking for something. They all blame Godou, explaining his Campione existence.
While the little MC girl with glasses kept saying this is not happening and stuff, the girls jump on Godou to help him forge the sword. (our poor MC girl is further shocked).
After the sword is forged Erica turned her sword into a Lion, and the whole group rode to some skyscraper (I think Tokyo tower? Was bored so didn't read closely). Water Dragon was on top it like King-Kong. Erica get injured in the fight, Godou active the sword to slice the dragon, then summon the Boar to finish.
After the Dragon is vanquished, the Boar destroyed the skyscraper.
Cue scene to the girl with glasses eating dinner with Dad (who suspiciously eating rice and look like Armatasu), repeating "this has nothing to do with us, nothing at all." She mentally disagrees.
The little girl went to class next day, thinking maybe she can also join the harem. Then watching Erica coiling around Godou saying stuff like "I was injuried helping you yesterday, give me love!"
She realized she would next make it. XD