Nagasumi's Grandfather

Nagasumi's grandfather is a wise and kind old man who has always been there for his grandson. He is a strong believer in love and marriage, and he is very supportive of Nagasumi's relationship with his mermaid bride, Seto. The grandfather is a retired fisherman, and he loves to spend his time in the ocean. He is a skilled sailor and he knows the sea like the back of his hand. He is also a very skilled fisherman, and he is always happy to share his knowledge with Nagasumi. The grandfather is a very wise man, and he has a lot of life experience to share with Nagasumi. He is always there to offer advice and support, and he is always willing to help Nagasumi in any way he can. The grandfather is a very important part of Nagasumi's life, and he is a great role model for him. He is a kind and loving grandfather, and he is always there for Nagasumi when he needs him.