Of Course I'll Choose to Save the World [Crossover]

As a member of the Yato clan, Yun Yunyun never regretted taking humanity's side when the aliens launched their final invasion of Earth. As she lay on the verge of death, her only regret was that she hadn't met sooner the idiots who had fought alongside her, and whose fates were now unknown. She suddenly opened her eyes and discovered that she had returned to twenty years earlier, before leaving Yato Planet to find her childhood friend Kagura. She rushed to the Yorozuya without stopping, only to find that this bunch of idiots seemed to know her already and greeted her one after another. There was also an ordinary young man with pink hair and an antenna, eating the same absurdly enormous chocolate parfait as Gintoki. It wasn't until she happened to meet a weirdo on a mysterious street corner who called himself Hououin Kyouma and shouted "El Psy Congroo" that she gradually realized she had returned to a different worldline. The future had deviated from its destined path. After hesitating, Yun Yunyun still told them what might happen twenty years later. Gintoki: Got it. You must've had your head chewed on by Sadaharu. Shinpachi: Is it April Fools' Day already? Kagura: Did you get poisoned by vinegar kelp, aru? Saiki: ... (I'd better pretend I don't know this is the truth.) CP undecided