Hikaru Aihara is the second protagonist of the yuri manga"Prism". She is a popular and friendly girl.she outsides most of the boys in sports, and she's managed perfect scores in almost every subject.
- She was so overjoyed for the reunion with Megumi that she couldn't help but hugging her at their first meeting.
- She said that Megumi's smell is great while sniffing her, and that she is adorable.
- Her first kiss with Megumi was at the beach three years ago from their current age, and for the second time was at the school's rooftop, her third kiss was at sleeping time, her fourth was a good morning kiss.
- She likes kissing Megumi and, she have been a lesbian.
- She fed Megumi a cherry tomato chapter 3.
- It's hard for her to control herself from touching Megumi, and she noted that she felt so happy for touching her tits.