I have to say I'm a little disappointed that he's already back in Inazuma but I guess this quest wouldn't have worked outside of his home region. And this quest was great lol
This is point for point the problem with youth culture in Japan which is a subject I talked about before. In this case it's more of a - still harmless - but portrayal of Japanese delinquents not following the rules. There are certain rules that do sound really ridiculous in Japan but stuff like properly registering and getting permits for a public event is done for safety reasons. Delinquents in Japan tend to do what they feel at any given moment and that gets them in trouble.
Thanks to Shinobu we can see these dumb stunts the gang pulls are for good intentions just that all 4 of these guys are dumb as bricks. But if they can keep their stupidity in check then their more open-minded and relaxed way of life is really something that Japan needs especially in an era of karoshi. It's also why Shinobu fell in with them when she's clearly more capable.
Also the mention of Sara visiting Itto's set up without anybody knowing why was such a tease. Clearly MiHoYo knows all about the ships and were baiting us.
Personally I didn't think about the Kujataki but I have to admit even I was hooked by the mention and wanted to know more. It turned out to just be typical Sara but then Itto said the one thing that rekindled the shipper core in me and now I'm daydreaming of another anime short lol
So of course we know Sara is a total Tsundere. She's also got a massive lady crush on Ei and I could just as easily see them together too especially with Ei's classic clueless protagonist. (she's a regular Bakarina) But I can just see the scene playing out.
Itto spends a whole day challenging Sara to a rematch. Half the time Sara isn't paying attention and half the time she just ignores him. Finally in front of Tenshukaku with a whole crowd having gathered to see the commotion Itto issues his challenge and Sara reluctantly accepts hoping to end it quickly and get away from the embarrassment. The fight starts with Sara pulling out all the stops to get the win. But unlike last time Itto actually shows some tricks and makes it through her barrage. She's surprised but just for a second thinking it's just a fluke. As the battle drags on Itto shows he's scouted every one of Sara's plays and is inching closer toward the kill. Sara clenches her teeth in frustration. This guy was supposed to be all talk and she's already embarrassed enough. But you know in the right light he's not bad lo- She shakes her head of the idle thoughts and notices Itto has closed the gap. Quickly she uses her skill and just barely dodges Itto's overhead swing. He looked pretty cool in that last atta- Sara summons her tengu thunder to end it so she can stop thinking stupid things. Dust kicks up as the battle winds down. Sara sighs in relief as she thinks she's won when suddenly - "Oni comin' through!" Through the dust she sees a faint orange glow and moments later an oni club pierces through and jabs her right in the gut. She's pushed back and tumbles to her stomach. As the dust settles Itto stands tall, his clothes torn, his breathing ragged but he's still standing. Sara looks on astonished and doesn't know what to make of the thoughts going on in her head. A few moments later Itto goes over to her and offers his hand to help her up. But Sara's humiliated. She quickly hobbles back to her feet, bows and accepts her defeat and then makes her escape. The grin on Itto's face suddenly drops. He's dissatisfied with the outcome but he doesn't know why.
I'm not sure how long it would take for either of them to figure it out but anime's pretty good about playing that "will they or won't they" game so I could see a full season about this. Your move MiHoYo. 
Tips and Tricks from a Super Casual Genshin f2p
