Hikari Tsuneki (常木 耀 Tsuneki Hikari) is a main character of Seiren. She is the class idol of class 2-B at Kibito High School and a classmate of Shouichi Kamita who was the runner-up of last year's "Miss Santa Contest" that she has an exclusive seat on the terrace.
Hikari is a cheerful girl who is occasionally stubborn.
Hikari is a "modern day meddling princess" who has a part-time job working as a cook in a restaurant and she just focus in her part-time job.
- The name Hikari means "shine, sparkle, glitter" (耀).
- Hikari's surname Tsuneki means "always" (常) (tsune) and "tree, wood" (木) (ki).
- Hikari loves to eat.
- Hikari was Tooru Miyamae's Playmate before, but it dissolved after that.
- Hikari does less housework.
- Like Haruka Morishima she is the popular girl female heroine in the story
- the same can be said also to Sae Nakata but she was more popular due to Junichi's help
- She's the only Heroine in the Amagami SS and Seiren anime whose relationship with the main lead is not clarified until the end (although it was implied they dated)
- She's the only Heroine in the Amagami SS and Seiren anime whose relationship with the main lead is not set in school rather in the summer school in which the series started