Ep. 6: Rinne bids farewell to her past while Kuon harbors misgivings about the future.
Aired on August 5, 2018

Karen and Sara are relieved that the darkness has lifted. In bed, Rinne asks Setsuna if she will be his Setsuna next time. The couple enjoys a happy day together as Rinne prepares to bid farewell to her past and move toward tomorrow. However, Kuon appears to have misgivings about the situation.
Episodes
- Ep. 2 · Setsuna Researches Soot Blight Syndrome After Rinne's Shocking Statement
- Ep. 3 · Setsuna, Sara, and Karen attempt to lure Rinne out during daylight hours.
- Ep. 4 · Setsuna Accompanies Karen to the Mainland for a Motherly Reunion Amidst Hidden Secrets
- Ep. 5 · Sara’s urgent hypothesis about Setsuna’s return meets Rinne’s dark confrontation.
- Ep. 6 · Rinne bids farewell to her past while Kuon harbors misgivings about the future.
- Ep. 7 · Rinne's haunting memory and Setsuna's revelation lead to a sudden disappearance.
- Ep. 8 · Rinne and Setsuna return to the mysterious island from five years ago
- Ep. 9 · Setsuna assists Rinne with a mysterious invention in an ice-encased underground shelter-city.
- Ep. 10 · Setsuna seeks a hopeful future for the city while making a final promise to Rinne