Do chisaki and Tsumugu get married?
After having a talk with Kaname about Chisaki’s true feelings, Chisaki finally accepts her love for Tsumugu and they become a couple. He is last seen walking to the train station with Chisaki as he leaves for college.
Who ends up with who in Nagi no Asukara?
Tsumugu
By the end of the story, Chisaki and Tsumugu become a couple, and she continues to live in the Kihara residence with a now-healthy Isamu, while Tsumugu is away for college. One of four childhood friends from Shioshishio. He is quiet and mature for his age.
Is Hikari and Manaka related?

Manaka and Hikari are childhood friends, she cares greatly for him and it is one of the few things we’re introduced to at the start of the anime is that Hikari is in love with Manaka. Manaka is the only one who can tell if Hikari is hiding something.
Why does Miuna have ENA?
When Miuna falls into the sea by accident, she develops Ena on her skin which allows her to breathe underwater like her mother.
Does Kaname end up with SAYU?
During the second Ofunehiki, Kaname saves Sayu from falling off the boat instead of following Chisaki – telling us that he is choosing Sayu over her now. In the last episode, it is implied that Kaname and Sayu have grown closer and the will be together in the future.

Does Tsumugu get Ena?
Some can gain Ena, such as Tsumugu and Miuna but seemingly only if they have people of the sea in their family lineage.
Is Hikari son of sea god?
In a surprising plot twist, it is revealed that Hikari is the reincarnation of the Sea God’s son. This is also hinted at in the seventh episode when Hikari went to speak to Lord Uroko, and the blue flames reacted to him and his anger about the humans on the surface.
Who is Miuna in love with?
Akin to Sayu falling in love with Kaname, Miuna became enamored with Hikari for him showing her kindness, albeit in a straightforward manner. With his brash attitude and his honesty, Miuna began to slowly fall in love with him, which furthered her feelings even five years after the time skip.
https://www.youtube.com/watch?v=nXNebCXULdg