Four years ago
"Kokoro, what's inside that bag?" Rin asked the six year old Haru as he and the others walked up the stairs to the Nanase household.
"It's something for Onee-chan." Kokoro answered, clutching the small bag she had in her hands to her chest. "Yesterday, I accidentally broke a dolphin figurine that belonged to her, and she was mad. So, I bought her something as a way to say I'm sorry."
"Is it what I think it is?" Makoto asked as they reached the house's door.
"Yep." Kokoro nodded her head. "I just hope it works. I don't like it when Onee-chan is angry with me."
"I'm sure Haru-chan will forgive you once she sees what you have for her, Koko-chan." Nagisa reassured the little girl.
"What is it?" Rin asked.
"You'll have to wait and see." Kokoro told him. Then she opened the door. "Onee-chan, I'm home!" She announced as she and the boys walked inside the house. Kokoro went into the living room and saw her cousin sitting at the table. "Onee-chan, I have something for you." She said as she walked over to Haru.
"What is it?" Haru asked in monotone.
"Something to say that I'm sorry for breaking your dolphin figurine." Kokoro replied. She reached inside the bag she had. "Take a look at this!" She pulled out a small, stuffed bear with light blue fur with dark blue jewel eyes.
'A stuffed animal?!' Rin thought in disbelief. 'There's no way Haru would want something like that.'
Then he saw Haru visibly stiffen as her eyes widened slightly when she saw the stuffed animal, her ocean blue eyes glazing over with what seemed to be an adoring look.
"I-Is this..." Haru started to say, staring intensely at the stuffed bear.
"It's for you." Kokoro said, placing the stuffed bear in her cousin's hands. "It's my way of saying I'm sorry for what I did."
"All is forgiven." Haru said without hesitation, not taking her eyes off of the item in her hands.
'What?!' Rin mentally exclaimed.
"Excuse me." Haru said as she stood up and ran up the stairs to her room.
"What was that just now?" Rin asked.
"That was another side to Haru." Makoto told him.
"Alright, come with me." Kokoro said to the boys. "You're about to see something interesting.
...
"I wonder what I should name you." Haru said as she sat on the bed in her room and stared at the stuff bear in her hands with adoring eyes, despite the fact her face was expressionless. A thought came into her mind. "I know. Your fur is the color of a blueberry, so I'll call you Berry."
Outside Haru's room, three certain boys and a six year old girl were trying to hold in their laughter as they watched and listened in on Haru by the door, which was cracked open a little bit.
"To think Haru had this side to her." Rin remarked, holding a hand to his mouth so he wouldn't laugh out loud.
"Isn't she cute?" Makoto asked.
"If she's ever angry at you, giving her a cute stuff animal will do the trick." Nagisa said.
"Onee-chan will forgive you for most things." Kokoro stated.
Suddenly, the door was slid wide open. The group of four yelped in surprise when they saw Haru standing in the doorway.
"Listen..." She started to say, turning her gaze to Rin. "If you ever tell anyone else about this, you're going to wish you were never born." She threatened, face void of any emotion.
"I swear, I won't tell a soul!" Rin promised, completely terrified of the young girl.
...
Four years later
"Onee-chan, I have something for you." Kokoro said to her older cousin, her hands behind her back.
"What is it?" Haru asked as she climbed out of the pool and walked over to Kokoro.
"Look!" Kokoro pulled her hands from behind her back and held out a small, stuffed bear with mango-colored fur.
Haru visibly stiffened the second she saw the stuffed animal, her eyes obtaining an adoring look.
"Here you go." Kokoro said as she put the little bear in her cousin's hands.
"Kokoro..." Haru spoke up, her eyes not leaving the stuff animal's. "You'll be having a lot of mackerel for dinner tonight."
"Hooray!" Kokoro cheered, giving a short jump into the air.
"Excuse me for a moment." Haru said as she walked towards the changing room.
"What was that all about?" Rei asked.
"Haru-senpai was acting strange." Gou remarked.
"If you want to see something interesting, follow me." Kokoro said.
"Eh?" They asked.
...
"I think I'll name you Mango." Haru said to the stuffed bear in her hands as she stared at it with an adoring look, even though her face was expressionless. "Your fur reminds me of the fruit."
"Haruka-senapi..." Rei started to say as the rest of the swim club watched Haru from the crack in the door to the changing room. "Likes cute stuffed animals?"
"That's so adorable." Gou declared, giggling.
"You've just witness another side of Haru-chan." Nagisa said.
"Be sure to keep this a secret." Makoto remarked. "Haru wouldn't like it if a lot of people knew about this."
"Is you tell anyone, you will regret it." A voice said.
Everyone yelped and jumped back when they heard the sound of Haru, who was standing in the doorway, her now dark gaze trained on Gou and Rei.
"We'll take this secret to our graves!" The first years exclaimed, completely scared of the young woman.