Okabe's small scale experiment is partially successful.

The part-time warrior from downstairs tells Okabe about the search for her missing father. Meanwhile, the aspiring mad scientist is troubled by a mysterious text message.

Suzuha reveals the orgins of SERN's future totalitarianism. While she continues her work to destroy the organization, Okabe and Mayuri continue the search for Suzuha's father.

The truth about Suzuha's father is finally revealed. Okabe realizes the devastating consequences of stopping her from leaving the night of the party.

In a further attempt to rescue Mayuri from her fate, Okabe reveals Ruka's past to her. Ruka must make a difficult decision that might change her entire life.