The Fated Encounter

After losing to a sudden ambush by an unfamiliar face, Yuichi now found himself somewhere he'd never been before. It's unlike anywhere he's been and it's a whole new world filled with adventure. It would've been overwhelming being here solo, but luckily with new sights comes new friends. Yuichi gets to know the turtles and make his temporary stay memorable before making his way back home.

Or in other words, what if Usagi got his time in Rise like every other incarnation of the franchise? What if the formula was changed up and it featured the new descendant, Yuichi Usagi, instead?