第 15 集: 由季詳細說明SERN的崛起，岡部修復她壞掉的時間機器以尋找她的父親。
Suzuha explains how SERN was able to build a time machine and use it to create a totalitarian world in 2036 and that she had planned to travel to 1975 to acquire an IBN 5100, but made a detour to the year 2010 to look for her father. When she tries to start the time machine she discovers it had broken down, which Okabe realizes was a result of the storm on the night he stopped her from leaving. Okabe then time leaps two days before the completion of the time leap machine, gathering the lab members and explaining the situation while getting Daru to fix Suzuha's time machine. Meanwhile, Mayuri suggests they also help Suzuha find her father, using his badge as a clue. Suzuha gives Okabe the Divergence Meter, which keeps track of the magnitude of differences between world lines, and tells him about how he founded the resistance against SERN in the future. After spending the day searching for Suzuha's father, she gives her thanks to Okabe, who suddenly receives a lead on Suzuha's father from a badge maker. (Source: Wikipedia)
集數
- 第 11 集 · Okabe 找到用於發送 D-Mail 的電視機抬升器，而 Kurisu 則提出時間跳躍以規避混沌理論的風險。
- 第 12 集 · 牧瀨紅莉栖完成時間跳躍裝置，岡部拒絕使用，鈴羽因炸彈威脅而逃離
- 第 13 集 · 岡部企圖透過多次時間跳躍，阻止牧瀨紅莉棲在實驗室中反覆死亡。
- 第 14 集 · 岡部企圖逃離Alpha世界線，以拯救真由理免於必死的命運。
- 第 15 集 · 由季詳細說明SERN的崛起，岡部修復她壞掉的時間機器以尋找她的父親。
- 第 16 集 · Okabe 改變時間線以拯救 Suzuha，從而改變 Mayuri 的命運與收束率。
- 第 17 集 · 岡部與牧瀨紅莉棲試圖逆向操作法爾斯的D-Mail，以取回IBN 5100。
- 第 18 集 · Okabe 和 Ruka 在逆轉 D-Mail 以改變命運的同時，經歷了一場尷尬的約會。
- 第 19 集 · Okabe 就自殺事件及神秘 FB 向 Moeka 對質，此前 D-Mail 嘗試皆告失敗。