It was a dark and windy night. Shimajiro was acting a little sad about what happened. He walked towards his room as Hana watched, concerned as to what had happened to him.
"Big bwother?" Hana asked.
Shimajiro went to where Hana was standing, which she proceeded to go towards him in a loving manner.
"It's okay, big bwother." Hana said to her older brother. "We know you didn't mean it."
"Oh, Hana." Shimajiro said. "Thanks, but I wanna be left alone right now."
The tiger shota approached his room. He then saw a mirror and noticed something off about his reflection. The reflection seemed to be a black figurine of him.
"Hello, there." the dark reflection told him.
"Huh?" Shimajiro said, confused. "Who are you?"
"I am the demon that you hide inside you, waiting to come out at any moment." The dark reflection said. "Don't forget, you can awaken me at any time."
The reflection went back to the normal reflection of the tiger shota. Confused, he went downstairs, as it was dinner time. At the table, Shimajiro's mother, Sakura, wanted to confront him about his battle with depression.
"Shimajiro, this might be a bad time, but are you feeling okay?" she asked.
"I'm just as worried about him as you are, Mama." Hana said.
Shimajiro's father, Shimataro, noticed his son's sad behavior.
"Ah. Shimajiro's dealing with depression right now?" Shimataro said.
"It could be possible." Sakura said. "I just can't bear to see him acting like this. He needs some help."
The next day, at his school, Mimirin notices that the tiger shota hasn't been acting like his happy self.
'Something's wrong with Shimajiro.' Mimirin thought to herself. 'I better go talk to him afterwards.'
As soon as the students were on their way home, Mimirin went to Shimajiro about his behavior.
"Hey, I've been noticing you've been having a hard time." Mimirin said. "Why is that?"
"Well…" Shimajiro said. "Do you ever feel like something is inside you that wants to lash out at somebody at one point?"
"Not really." Mimirin said. "Why'd you ask?"
"I've been fighting with myself for the past week, and I have no idea what's causing it." Shimajiro said.
"Well, don't worry." Mimirin said. "We're always available to talk to if it continues onward."
"Oh, okay." Shimajiro said, smiling a bit.
Later at home, Shimajiro enters the house with Hana hugging him.
"Welcome home, big bwother." Hana said.
"Oh. Hello." Shimajiro said.
"You got whatever it is you had making you be sad to go away?" Hana said.
"Yes." Shimajiro said. "I got it all out of my system."
"Oh, good." Hana said, smiling. "I was hoping you'd get over your sadness."
Later, Hana and Shimajiro got into a huge fight, resulting in the tiger shota getting into trouble. That night, Shimajiro was sulking and sobbing. Eventually, his sadness transformed into a pure hatred and anger towards his own sister.
"I'm sick of it!" Shimajiro said angrily. "I'm sick of my sister always getting me into trouble! And on top of all that, she got me grounded today!"
Shimajiro then proceeded to walk towards his mirror and see the dark reflection he saw last night.
"Having a bad day?" the dark reflection asked.
"Yeah!" Shimajiro said angrily. "I'm completely done with my sister! She's put me through so much pain and misery, and I can't take it anymore! I'm ready to uncage you!"
"Okay." the dark reflection said. "When your family goes to bed, go outside, and you should see a full moon. There, you and I will become one."
Later, Shimajiro makes his way outside the house, when his sister shows up.
"Big bwother…" Hana said. "I'm sowwy for what I did."
"I'm still not over it!" Shimajiro said angrily, pushing her. "I went through so much pain, and you've been the cause of it! If you don't like me, I might as well just leave you and make your life as miserable as you've been making mine!"
Hana gasps at what she heard her older brother said. Eventually, Shimajiro leaves the house in anger.
"Big bwother, no…" Hana said, teary eyed before eventually crying.
Meanwhile, the tiger shota makes his way into a forest. He was running off in anger when he tripped on a rock, tearing his shirt sleeves and shorts and scratching himself in the process. He then takes a peek at the full moon.
"Well, at least I can relax for a while." Shimajiro said.
Soon, he ends up surrounded in a dark blue aura.
"Huh?" Shimajiro said. "What's happening to me?"
Shimajiro notices that his hands started to grow some claws. He then started to get down on his hands and knees, tearing up as he closed his eyes.
"I'm sorry, Hana!" Shimajiro said in pain. "I had no choice."
Soon enough, he succumbed to the darkness and lied down on the floor. Once the aura cleared, he got up and opened his eyes, he decided to go to a mirror. He saw his new appearance. His shirt now looked like a short sleeved shirt, his eyes were now fully black, with dark blue pupils, and there was a scratch mark on his stomach. What was once a little innocent tiger shota has now become a monster consumed by darkness. This was the birth of the psycho, Dark Shimajiro. He laughs an evil laugh and breaks the mirror.
"Finally!" Dark Shimajiro said. "I'm ready to put an end to you and everyone you love!"
Dark Shimajiro then took off in a dark blue aura, searching for some victims for him to kill.