|Name in Japanese||満潮 永澄|
|Rōmaji Translation||Michishio Nagasumi|
|Debut (Anime)||Episode 1|
|Debut (Manga)||Volume 1|
|Appears in||Anime, Manga|
|Voice Actor (Japanese)||Takahiro Mizushima|
|Voice Actor (English)||Todd Haberkorn|
Nagasumi is a average size boy with black hair (with an ahoge) and blue eyes which makes him a close image resembling his Father. Nagasumi is seen wearing a his all black high school uniform but is seen wearing other outfits outside of school.
Nagasumi is a calm, average, smart boy for his age and most likely the only one in his family who has a clear head, apart from his grandmother.
Powers and Abilities
When push comes to shove, Nagasumi demonstrates a great deal of inner strength. Sun often uses her Song of Heroes to power Nagasumi up in battle situations, but in the case where Sun is directly threatened he is able to activate the power-up by himself. After being abused, punched, and attacked throughout the series he later becomes an expert at reading moves which allow him to dodge attacks at an inhuman rate due to Maki constantly attacking him. He is able to sense the level of danger in a fight; this is shown when the top hair on Nagasumi's head stands up and acts like a signal tower to show a level indication of danger. At the end of the series it is shown that he no longer needs to hear Sun's hero song to become stronger he manages to empower himself just by being near her.
He decided to face his fears and take on the responsibility of taking care of Sun as his wife, although it doesn't make it easy on him due to almost everyone in the Seto group (except Sun's mother—Ren, and Masa) who are against their union. As the series progresses, however, he truly falls in love with Sun.