".... What? What happened...? "

When I came too, I feel dizzy. Currently, it seems i was sleeping on the floor. When I tried to sit down, I felt a stinging pain in my head and realized it bleed out a bit.

Checking my surrounding, it seems I am in my own room, then I saw my old safe box on the floor with a bit of blood on the bottom

"Did the safe box fall on my head? "

I feel aloof and feel like I was forgetting something. Then I tried to remember what just happened.

"...? I don't remember how it fell on my head. "

The last memory I had is me just walking down the street, trying to go home from school.

"How did I get to my room again? And it feels my room is a bit different? "

Trying to calm myself, I sit on my bed and look at my phone to see if there is anything different.

".... Eh!? No way... "

When I saw the date, it's been 4 months in the future from my perspective.

"did I just... Lost my memory? "

I tried hard to remember about myself

My name is shinonome Kouta, 16 years old, I live with my mother and my little sister, and has been around the neighborhood since I was born

My relationship with my mom is bland and it's kinda bad with my sister, shinonome rika. I have an average grade and a kinda gloomy personality, maybe that's why my sister that always stylish and pretty, looks down on me.

Even though we used to be so close, it changed when she hit puberty and become a higher caste in her class. She used to call me "onii-chan", but now she calls me "you" or "hey".

I also had a childhood friend, but we grow to estrange now. It's kind of sad looking back at my life really.

I'm kinda confused now that my memory from the past 4 months is cut off. Well, the first thing I have to do is confirmed it with my family i guess.

It's 8 in the morning, I guess mom and rika already got up. I get out of the room and suddenly I meet rika in the hallway. She looked at me with a shocked and pale face, and then, with a downcast eye she say,

".. Go-good morning... "

Its kinda weird and unusual that she greeted me in the morning, but it's just right for me to return the greeting

"Ah, un. Good morning, rika"

".....Eh? "

Suddenly rika looked at me with a stunning face

"o-onii... Chan..?

"hm? What's wrong rika? Eh? 'Onii-chan?'"

Did rika... Just called me 'onii-chan'?

"onii-chan...! Oniii-chan!! Waaaaaah!!! "

Suddenly rika hug me tightly while crying. Eh? what? What happened?