The dark untold story of Steins;Gate that leads with the eccentric mad scientist Okabe, struggling to recover from a failed attempt at rescuing Kurisu. He decides to give up and abandons his lively scientist alter ego, in pursuit to forget the past. When all seems to be normal, he is seemingly pulled back into the past by meeting an acquaintance of Kurisu, who tells him that they have begun testing a device that stores the memory of a human and creates a simulation of them with their characteristics and personalities. Okabe begins testing and finds out that the simulation of Kurisu has brought back anguish and some new unexpected tragedies. Zero is a side story that explores events from the Beta Attractor Field's future that contribute in making the end of the original story possible.
Episode 1
Though WWIII is on the horizon, Okabe attempts to live a normal college life. However, a newly developed AI is about to shake up his world.
Episode 2
After a chance encounter with Maho where they discover knowing someone in common, Okabe has his first face-to-face with her special AI, Amadeus.
Episode 3
Mayuri tries to bring everyone together for a Christmas party at the lab, but Okabe has a rude awakening.
Episode 4
While Okabe is left with more questions than answers, Suzuha recruits help in her search for an unexpectedly close person.
Episode 5
Their search continues as New Years swiftly approaches, though Ruka's dilemma with a certain guest might make matters worse.
Episode 6
Now that the girl's identity is known, Okabe and friends kick off the New Years with a shrine visit and party to never forget.
Episode 7
As Okabe seeks answers regarding the attack, trouble with Amadeus brings a surprising turn of events.
Episode 8
Okabe is given a bittersweet reminder that in changing world lines, sacrifices must be made.
Episode 9
It will take time for Okabe to identify the attackers and their motivation, but the impending crisis of WWIII forces Suzuha to resort to desperate measures.
Episode 10
After reinforcements are called to clean Maho's disastrous room, her and Okabe's Akihabara date ends with a surprising confession from Maho.
Episode 11
Okabe must convince Maho to give up her prized possession, but an unexpected danger has them negotiating for their own lives.
Episode 12
Kagari attempts to track down the origins of a song in hopes that she discovers her lost memories.
Episode 13
After finally obtaining a hint into Kagari's lost past, Okabe ends up discovering much more than he bargained for.
Episode 14
Shocked by a surprise attack, Suzuha and Daru look to America as their last hope to save the world.
Episode 15
Fed up with her Dad's passiveness, Suzuha must make a man out of Daru before Yuki ends up with somebody else.
Episode 16
Okabe's stubbornness causes fists to fly and tears to be shed as the deadline for using the time machine swiftly approaches.
Episode 17
As Suzuha sets off to finish her mission, Mayuri finds determination of her own. But then, disaster strikes.
Episode 18
All hell breaks loose over the time machine when a villain from the future haunts the past and unveils their devious plan.
Episode 19
War and disaster has come, and the only way Okabe can stop it is to rely on his friends, determination, and hope.
Episode 20
Okabe awakes in a cold, lifeless world where he finds his friends struggling to survive amidst all the chaos.
Episode 21
Setting forth on a long and arduous journey, Okabe seeks to rekindle his hope and revive what all had thought gone.
Episode 22
In their struggle to save the time machine, the lab members brainstorm to circumvent convergence but realize it cannot be done without sacrifice.
Episode 23
Okabe and his friends must battle against fate in the past, present, and future to find Steins Gate and reunite the lab members once and for all.
