It wasn't one and done.
Chris Jericho made an appearance at the last moments of New Year Dash last night, attacking Tetsuya Naito ju♏st as he was about to leave the ring following a successful main event. The two brawled, with Jericho becoming incensed each time Tetsuya Naito mocked him by lying in the ring or sitting on a chair, exuding tranquillo. Jericho was eventually taken away backstage as Naito stood tall.
There is some backstory behind this, at least in a non-kayfabe manner -- Naito seemed flippant when talking to Yahoo Japan recently about Wrestle Kingdom 12 being a double main event, saying it was he and Okada who were headlining the show. Jericho wasn't happy about that, saying it was New Japan that was calling it a double main event, not him, and if he didn't like it, toug🔯h luck, it's pro wrestling.
It'll be interesting to see if this is a future match for the New Beginning shows, or somewhere later down the line. In a recent NJPW Fight-Size update, it was noted that Chris Jericho is free the w🌜e🍌ek of Strong Style Evolved.