Aya Asahina

"I hope this world will end!"

Sekai no Owari kara

As a child, Manami attended her father Takuma's boxing matches and marveled at the scarlet shoes he wore. Unfortunately, he and his wife died in a terrible accident while he was preparing for the long-awaited championship. Now a single mother of a daughter she adores, Emi, Manami has decided to follow her father's footsteps and is back in the ring after her husband died of a long illness. However, her mind and body are not there and she is humiliated. Sinking into poverty, barely able to feed Emi and losing every job she has, her mother-in-law gains custody of her daughter. Overwhelmed by grief and anger, unable to catch her breath, she falls to her lowest point. However, her coach comes to pick her up from the Fukuoka Red Light and promises to make a champion of her so she can reconnect with Emi.

Yuko Morimiya is a high school student and she lives with her stepfather Morimiya. Morimiya is her third father. Her mother, Rika, is a free spirited person and has remarried several times. She disappeared from Yuko's life at a certain point. Even though Yuko and her stepfather are not blood related, she is fully loved by her him.

Iori Kitahara procura por uma nova vida da Península de Izu enquanto se prepara para iniciar uma nova vida universitária lá, permanecendo em um quarto que fica sobre a loja de equipamentos de mergulho de seu tio, conhecida como “Grand Blue”. No entanto, ele fica chocado quando conhece o clube de mergulho local, um grupo de homens musculosos que passam mais o tempo bebendo, festejando e ficando quase nus do que mergulham. Apesar de suas tentativas de se distanciar do grupo, Iori é rapidamente pego em suas travessuras, enquanto suas primas tentam mostrá-lo as maravilhas do mergulho no oceano e no mar.