Primary

• Keitaro Urashima Childhood friend of Naru Narusegawa
• Keitaro Urashima In love with Naru Narusegawa
• Keitaro Urashima Cousin of Haruka Urashima
• Keitaro Urashima Husband of Naru Narusegawa
• Keitaro Urashima Adoptive brother of Kanako Urashima

Extended

• Haruka Urashima Cousin of Keitaro Urashima
• Naru Narusegawa Childhood friend of Keitaro Urashima
• Naru Narusegawa Wife of Keitaro Urashima
• Kanako Urashima Younger Sister of Keitaro Urashima
• Kanako Urashima In love with Keitaro Urashima