The Agent of Spring, a kind-hearted 16-year-old girl with the power to promote life. Ten years ago, she was kidnapped by bandits; the trauma broke her mind, and she returned as a different personality. She speaks haltingly and in fragments. She feels guilty that she couldn't 'return' the original Hinagiku to everyone, but she looks forward to reuniting with Kousei and Itechi, hoping at least to let them meet her current self. First person: I (polite). Second person: -sama (respectful), but uses no honorifics and casual speech with Sakura. She calls Itechi 'Big Brother Itechi'.

The 17-year-old bodyguard to the Agent of Spring, Hinagiku. She deeply regrets failing to protect Hinagiku ten years ago. As a child, she studied swordsmanship under Itechi for a short time and harbored romantic feelings for him. Ten years ago, the Village of Spring called off the search for Hinagiku after only three months and turned to the Village of Winter as their last hope. However, when Kousei and Itechi also ceased their search after five years, she felt betrayed and now harbors a deep hatred for them. First person: I (polite). Second person: -sama (respectful). She addresses Itechi and Kousei bluntly without honorifics.

The Agent of Summer, a bright and gentle girl with the power to command life. She is Ayame's younger twin sister and loves her dearly, but they have been fighting frequently since she learned Ayame intends to resign as a bodyguard. She feels frustrated by the unreasonable treatment the Agents and bodyguards receive. First person: I (polite).

The bodyguard to the Agent of Summer, Ruri, and her older twin sister. She considers resigning from her post, but ultimately cannot bring herself to do it because she prioritizes Ruri above all else. While she looks identical to Ruri, she possesses a more pragmatic and ethical mindset.

The Agent of Autumn, a pure and innocent 7-year-old girl and the youngest of the group. She possesses the power of life decay. She struggles with using her abilities indiscriminately. She places absolute trust and affection in Rindou, who protects her. First person: I (polite). Second person: -sama (respectful). She addresses Rindou bluntly without honorifics.

The bodyguard to the Agent of Autumn, Nadeshiko. He treats Nadeshiko like a gentleman, and while he claims behind the scenes that guarding her is strictly business, he is unconsciously overprotective of her. First person: I (rough, casual). Second person: -sama (respectful). He addresses Nadeshiko bluntly without honorifics.

The Agent of Winter, a 20-year-old young man and the oldest of the agents. He possesses the power of life freezing. He met Hinagiku and Sakura ten years ago and fell in love with Hinagiku at first sight. Since her kidnapping, he has blamed himself and lived in constant regret. He suffers from trauma-induced nightmares about the incident and cannot sleep properly without medication. He trusts Itechi implicitly but often makes a face when Itechi gets too naggy. First person: I (rough, casual). Second person: By name.

The 29-year-old bodyguard to the Agent of Winter, Kousei. He is the oldest among all the agents and guards. He used to teach Sakura swordsmanship, and like Kousei, he feels responsible for failing to be there for her when Hinagiku was taken. He is ruthless as a bodyguard but a kind-hearted man at his core. He often finds himself exhausted from looking after Kousei. First person: I (polite). Second person: -sama (respectful). He addresses Kousei and Sakura bluntly without honorifics.