A new transfer student, he replaces Najika as the culinary representative. Seiya looks a lot like Sora, causing Najika and Daichi to mistake him as Sora. He egotistical, using "Ore-sama" (オレさま, "Ore-sama"?) instead of simple "Ore" as his "I". (Japanese use different "I"s with different degrees of politeness and formality.) He flirts with Najika in the public, causing girls to envy her (in comparison with Sora and Daichi, where they're more jealous). Although she's rather annoyed with him. Later on he falls in love with Akane. He had told Najika that in the past, he had given her flan, causing Najika to think that Seiya was her Flan Prince
for a short time. It wasn't until Najika confronted him and said that she liked someone else, and started talking about how he saved her that one day. Seiya had no clue what she was talking about, causing Najika to wonder again.
Seiya made the flan,and Daichi gaved her the flan 6 years ago in Hokkaido.(Source: Wikipedia)