Sei Inaba

Sei is a character in Breathe Deeply. After time spent with Yuko he becomes a researcher to develop polymer based organs.

Personality
He is described by others as not very sociable, and by Ryo as reticent. What happened to Yuko had an adverse effect on him to the point where he felt he did not have emotions like happiness, or sadness. He is willing to take measures such as issuing a sincere Zarei bow to outright violence to get what he needs to help Yuko. Though overall serious in nature he is against animal research. He loved Yuko dearly and enjoyed his time with her.

Sei was interested in science from an early age and had aspirations to become a chemical engineer.

Appearance
He has short light colored hair and wears shirts and trousers both in his early life and as a professor later on.

Story
Sei is delivering a lecture on polymers and shows a functional heart made of out the material.

In his mind he tells Yuko that he finally did it and he thinks back to when he was younger when Yuko was in hospital assuring him that she had plenty of time left.

He also met one of Yuko's friends, a boy called Oishi who also came to visit her in hospital. Coming across him again, their conversation includes him sharing his dream of making life. Sei is taken outside to enjoy the seaside area by Yuko and he helps her and Oishi understand the elemental link between nylon and people by drawing the chemical equation in the sand.

Sei enjoys his time with Yuko and Oishi whilst also taking part in summer classes.

He remembers a time when it was snowing and Yuko asked him to walk her home. Sei is told Yuko is to go to America for some tests and possibly a transplant. As he leans in to kiss her, Yoko's father comes across them and he waves goodbye to Yuko.

With Yuko now only kept alive via a respirator, Sei is asked by Yuko's father what she wanted for herself should a situation like this ever happen.

Attending the funeral, Sei is confronted by Oishi who is angry feeling that Sei was responsible for Yuko's death for pulling the plug.