Chapter 4: 16 Years Old’s Prologue
December 25th. Morning. The sunlight and the crisp cold air leaked into the room through the gaps in the curtain.
I dazedly covered myself in the blanket a little tighter.
Today’s my birthday, Christmas, and the closing ceremony. What a busy day.
The alarm hasn’t gone off yet. I’m still enjoying the warmth of my blanket-
“Merry onii-sama! Happy birthday to you!”
The sound of pulled party fireworks echoed in the room, along with Kaju’s cheers.

So this is what she’s doing this year. I rubbed my eyes and sat up.
“...Good morning, Kaju. You’re so energetic.”
“Indeed, today is worthy of celebration, after all. Here, onii-sama, get up.”
Kaju spun around once in her red dress. The bottom part is swaying around.
“Eh, what’s with your outfit?”
“Yes, I’m dressing up as Santa Claus because it’s Christmas. What do you think?”
Kaju’s outfit is a Christmas dress. There’s a reindeer horn headband on her head.
“Yes, very cute. But Kaju, isn’t Christmas banned in our house?”
“Indeed, onii-sama is right. It’s because Kaju is baffled every year.”
Kaju came here and kneeled on the bed.
“Even though today is onii-sama’s birthday, people only love Christmas for some reason. Kaju has been up against a world like this constantly. In other words, this is Christmas versus onii-sama.”
Isn’t my enemy way too strong?
“But Kaju has realized it already. Perhaps everyone in the world is celebrating onii-sama, right? Are all of the light decorations for onii-sama…? I thought about this for the entire night and had successfully made peace with Christmas.”
“Glad to hear that. So, you should go to bed.”
Eh, but she said she only accepted Christmas this morning-
“When did you buy this Christmas dress?”
“I don’t know why this is under Mom’s wardrobe-”
“Alright, stop. I’ll pretend I didn’t hear that.”
Information overload in the morning.
“Kaju’s winter holiday is starting today. That’s why I need to do my best to prepare a big meal tonight. The main course will be a whole Mikawa roasted chicken. Please look forward to it.”
“Oh, looking forward to it.”
“Yes! In a sense, today marks a new beginning of onii-sama. Even though it’s a little surprising, Kaju will do my best to support you!”
“Beginning….? It’s indeed my birthday today, but aren’t you exaggerating it a little?”
Kaju closed her hands before her chest thoughtfully.
“Kaju is very surprised with what happened yesterday. However, Kaju will definitely support onii-sama’s decision!”
…What is she talking about? I just got home, took a bath, and went to bed normally yesterday night.
“Did Kaju tail me yesterday?”
I said that half-jokingly. Kaju nodded.
“Indeed, I was curious to see who onii-sama had invited.”
“Eh, you really saw us!?”
“That girl is from Tsuwabuki High School, right? I’ve seen her during the summer trip!”
-The Literature Club’s summer trip. I think Kaju was in that Toyohashi City Student Council Summer Exchange Camp on the same date as well.
Even though nothing had happened between Shikiya-san and me, it was a little embarrassing when my family saw that…
“Kaju, I think you misunderstood. I’m not going out with that person.”
“I knew it! That girl is a girlfriend candidate to onii-sama, right!?”
Kaju approached with a bright smile. Her cheeks are red.
“There are probably a lot of hiccups, but Kaju will always be on onii-sama’s side, you know?”
“That person is the senpai in my school. We don’t have that relationship. Here, get off my bed.”
“Sure, please cultivate the romance between you two! Kaju will definitely watch over you two silently this time!”
I see. Well, thanks a lot. Kaju yawned and rubbed her sleepy eyes.
“Kaju, you didn’t have a good sleep yesterday, right? No need to prepare dinner. Go to bed.”
“I need a bake a triple-layered cake. There won’t be enough time if I don’t start now. Also, the chicken is fresher if it’s killed in the morning!”
Uh, she’s killing it right now? No way, right?”
“Onii-chan just wants a simple cake! Just a single layer is enough!”
“But, but, onii-sama, won’t that be too lonely? I still want to kill and bake an entire chicken…”
“Then I want salty riceballs, tofu, and a plate of vegetable salad.”
I’m planning to be a vegetarian for the day. Kaju’s cheeks pouted unhappily.
“...Give me your arms.”
She mumbled quietly.
“What?”
“I’ll sleep if onii-sama gives me an arm pillow.”
Sleeping together has been banned in my house since Kaju entered middle school, …but there’s no way out this time. I leaned on my bed and reached my arm out.
“I’ll only stay until Kaju falls asleep, alright?”
“Yes, onii-sama!”
Kaju immediately laid down next to me.
“Hehe, it’s been so long since I’ve slept with onii-sama, right?”
“It’s been two years since you entered middle school, right?”
“...Yeah.”
What’s with her tone? Don’t tell me she has been sneaking into my bed whenever I don’t notice.
I wanted to question her further. However, Kaju is already snorting regularly.
She didn’t sleep well last night. No wonder she falls unconscious this quickly.
Oh, it will be bad if my alarm wakes Kaju up. I reached my other hand out and turned it off. Now I have to prevent myself from falling asleep again.
However, there’s no way I can sleep since Kaju’s on my arm. I should just rest my eyes. Yesterday night was a lot for me, after all.
But the blanket…feels really warm. Perhaps it’s because Kaju’s sleeping next to me, right…?
I can…sleep for a little more, right…? I have set…an alarm, …right…?”
In the end, I lost my perfect attendance award because I was late on the last day of the second semester.
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