I Neglected My Boyfriend Miya Atsumu While Organizing the Interworld Sports Games (Haikyuu!!)

[Rina 6.0] Rina x Atsumu Miya, high school AU in the main world, a joint training camp and tournament bringing together forty schools from different worlds Three days ago, Shijo Rina received a mysterious invitation from an online friend named Sky: Come help me put together a one-of-a-kind World Cup! Participants: athletes from university tennis, basketball, volleyball, baseball, and other sports clubs. But then, three days later, she received another message: Emergency! Someone scammed me by claiming my boyfriend had died, and I have to go deal with it right away. I won't be back for a while, so I'll leave everything to you. If things go smoothly, I'll come watch the tournament with my boyfriend once it starts. P.S. I've already invited fifty schools, and twenty-three have agreed. For the time remaining, you can invite any schools that meet the System's requirements. The training camp starts in two days, so remember to send your invitations before the deadline! P.P.S. That's all for now. I have to board my flight and take care of things. Best of luck with the tournament! Your dear friend, Sky Shijo Rina stared, stunned, at the System screen before her. Its permissions had been transferred to her. She couldn't help turning to her boyfriend. "Atsumu, if you had the chance to attend a joint training camp and tournament with 39 different schools, would you be up for it?" Miya Atsumu thought his girlfriend was joking and laughed. "How could anyone turn down an opportunity like that?" So, two days later, he, Inarizaki, and the volleyball teams from other schools all found themselves in an unfamiliar place. Miya Atsumu looked at his girlfriend. Rina gazed back at him innocently. Miya Atsumu: ... Then the contestants selected by the System for each event made their entrance: "Yuji Itadori" became a long-distance runner. "Megumi Fushiguro" became a rhythmic gymnast. "Kyoya Hibari" became a fencer. "Masaharu Niou" became a... "Tōru Oikawa" became a... At the same time, people in another world were left utterly baffled. "Itadori, since when do you compete in marathons?" "So that's what Niou meant when he said he was going traveling..." There were even crossover comics about them appearing in the real world. The male lead, Miya Atsumu: Is it really okay for his girlfriend to ignore him? P.S. I suddenly got a new idea, so I switched to this premise. Overall, it isn't much different. Theme: Different futures, different kinds of light