Ep. 21: Manaka wakes without Ena while Miuna struggles with breathing issues and Tsumugu reveals a fishhead curse.

Hikari and his friends are surprised by Manaka, who wakes up acting as if nothing changed, with no Ena remaining on her. Meanwhile, Miuna, who left home earlier and is accompanied by Sayu, soaks her feet in water at school because she mysteriously acquired Ena and feels difficulty breathing like sea people. Sayu asks if Miuna is unhappy about Manaka waking up. Miuna states she is happy but feels somewhat different than imagined. While Manaka plays with salt flake snow with Chisaki, Hikari and Kaname discuss how Manaka stays the same. Kaname suggests it is because her friends are there for her, and because of Hikari himself. Hikari notes that Manaka does not remember events before hibernating but recalls a voice, unsure if it told her to give something or that she will be given something. They later go to the school rooftop and meet Miuna and Sayu, discussing study. Chisaki feels left out since she is the only one who already went through it, goes to the hospital, and meets Tsumugu and his grandfather. At the hospital, Tsumugu says he will return to the city at the end of the month. He promises he will come as soon as he can, calling, and always giving Chisaki news immediately. Chisaki jumps to the conclusion that Tsumugu is lonely, while Tsumugu worries about Chisaki being left out and lonely. Chisaki says she is fine since her friends are all there and she will be busy with Manaka. Hikari and Miuna's family have dinner and invite Sayu, Kaname, and Manaka; Chisaki and Tsumugu, however, decline the invitation. Early next morning, Tsumugu runs over to Hikari's home and reveals a live fishhead protruding from his left arm, similar to that on Manaka's knee in the first episode, and reveals that Uroko must have cursed him. Hikari gleefully takes this to mean that Uroko must be nearby.
Episodes
- Ep. 17 · Kaname reunites with friends while Sayu overcomes rejection and the group plans a sea village return.
- Ep. 18 · Miuna Finds Manaka in the Trench as Shioshishio Collapses
- Ep. 19 · Chisaki learns a new legend while Manaka remains asleep and Hikari seeks answers.
- Ep. 20 · Hikari searches for Uroko while Miuna questions her feelings and Manaka wakes up
- Ep. 21 · Manaka wakes without Ena while Miuna struggles with breathing issues and Tsumugu reveals a fishhead curse.
- Ep. 22 · Hikari searches for Uroko while temperatures drop and Manaka's lost memories complicate his feelings.
- Ep. 23 · Hikari confronts Tsumugu while Miuna and Sayu navigate their own romantic confessions.
- Ep. 24 · Chisaki flees to surface while Tsumugu plans Ofunehiki using Manaka's stone to restore her memories.
- Ep. 25 · Akira loses Manaka's pendant in the sea, leading to revelations about past feelings and a dangerous festival ritual.