OVA: Episode 23(β) Open the Missing Link

Released on December 3, 2015 titled as "Kyoukaimenjou no Missing Link-Divide by Zero"

This episode is an alternative to the 23th episode,

this is the prequel of Zero : It's in this worldline that the story will take place.

SPOILER

In this story, after killing Makise Kurisu, Okabe Rintarou gives up and accepts her funeral fate.

''The main difference between this and the original episode 23 is that this Okabe does not receive the Video-Mail from himself. HE will go on to eventually create Operation Skuld and the Video-Mail, helping S;G Okabe thwart world line convergence and successfully avert both Kurisu's death and WWIII in order to enter the Steins;Gate world line of 1.048596% divergence.''