Chiaki is Haruki Serizawa's older brother, though he's only a minor presence in the Confession Executive Committee: Love Series—he appears mainly through flashbacks since he's already dead by the story's start. The two look almost identical, which isn't surprising given they're siblings, though Chiaki's hair tends to be messier than Haruki's. Both have blond hair, though Chiaki's shows brown roots; the anime adaptation ditches this detail and gives him fully blond hair instead.
There's a memorable moment in his backstory where he saves a girl from drowning. Not long after, he dies from an unspecified illness. Fans often note the tragic simplicity of his character arc—a brief act of heroism followed by an early death that shapes his brother's story.
He typically wears his school uniform open, giving him a more relaxed or careless appearance compared to how Haruki presents himself.
Content compiled by AnimeList.moe from publicly available sources.
