Yandere and Menhera - Suddenly Having a Yandere Older Stepsister and a Menhera Younger Stepsister Makes Every Day Difficult - Chapter 1 - 1

Explosive Stepsister Birth!

In this world, there are various “complexes” such as Brother Complex and Lolita Complex.

And in this world, there are also personalities formed like “dere” types, such as Tsundere and Yandere, to name a few.

I am a person who doesn’t particularly fall under any named complex. Furthermore, I don’t belong to any “dere” types like Menhera^[1]a portmanteau of “mental health-er” girls, female characters who exhibit unstable emotionality, obsessive love, and stereotypical self-injurious behaviors such as wrist cutting., Yandere, Tsundere, or Kuudere.

However, now I am being relentlessly pursued by a Yandere older stepsister and a Menhera younger stepsister, who perfectly fit into these “dere” categories.

“Hey. Why are you avoiding me?”

“N-no, Ririka, I’m sorry!”

“…I just want you to pay attention to me because I love you, Onii-chan. Don’t run away.”

“O-okay, I got it!”

My younger stepsister, Ririka, wants me to only look at her. She wants me all to herself. She’s a personification of self-desire. As I was troubled by my younger stepsister, my older stepsister approached from behind with a sad face.

“R-Ririka, step back.”

“Hah?”

“He’s troubled!”

“Wow. You’re planning to monopolize Onii-chan. Even though Onii-chan loves me a lot.”

“You won’t be liked just because you’re a lump of self-desire…?”

“Shut up!!”

My older stepsister, Matsuri, is timid and crumbles the moment her sister lashes out at her.

“Now, now, both of you, calm down.”

These are my days with my Yandere older stepsister and Menhera younger stepsister, Kanazawa Ryusuke.

◆　◇　◆

Entering elementary school, middle school, high school, and college, one’s environment changes, and as humans, we grow and change as well.

It was just another day. I was living my usual life as a middle school student and was on my way home as usual.

I come from a single-parent family, with my father having been absent since I was young. Raised solely by my mother, I love her dearly. That said, I wouldn’t say I’m overly dependent on her.

It was after I had returned home and changed out of my school clothes, heading to the living room, that my mother, with a serious look on her face, started talking to me.

“Hey, hey,”

“What’s wrong, Mom?”

“There’s something I need to talk to you about, is that okay?”

My mother, more wrinkled than usual, was looking down when she spoke. The last time I saw her like this was when my father died.

Bracing myself, I nodded in agreement, and she led me by the hand to what is usually our guest room.

As the door creaked open, inside sat a remarkably handsome man, that could be described as a cool older guy, flanked by two cute girls.

“What’s this?”

“Oh, well, Ryusuke, you’re about to enter high school, aren’t you?”

Indeed, I am currently in my second year of middle school, soon to become a third-year, which is a time when parents and their children often feel pressured about entrance exams.

After a few moments of thought, I nodded to my mother. Then, she went over to the man and kissed him on the cheek. At that moment, I understood.

“You want to remarry?”

“Ryusuke, how many years has it been since your father died?”

“He died when I was about three, so it’s been over ten years now.”

“So, I was thinking, maybe if Ryusuke wants to do something and has to go far away, I would feel lonely. That’s why I…”

“I understand. It’s okay.”

I thought whatever made my mother happy was fine with me, regardless of whether the person had children or not.

Noticing my immediate response, the man looked surprised and asked,

“Is that okay with you?”

“What do you mean?”

“You don’t even know my name, what I do for a living, or who these girls beside me are. And you haven’t asked.”

“It would be pointless to ask. If I know you have kids, there’s nothing else I need to ask. Besides, if my mom chose you, I have nothing to say.”

“Really? Well, I haven’t been asked, but I’ll tell you anyway.”

The man was about to introduce himself, but just as I was about to say I didn’t need it, a small girl, looking to be around second grade of elementary school, spoke up.

“Papa. Matsuri nee-chan. Before introducing myself, shouldn’t there be something else you say first?”

“Oh, right. Yes, Ririka.”

The girl, referred to as nee-chan, had a frail body but was notably well-developed, challenging for a middle schooler like me.

As I observed the two, Ririka (the younger sister) and Matsuri (the older sister), along with their father, turned to me.

“I know it’s terrible to say this, but please hear me out. We’ll transfer 300,000 yen to you three every week, so could you three please live in this house by yourselves?”

“Um?”

“It’s understandable that you’re confused. But I haven’t yet earned the trust of your mother. That’s why I want to live with her for a while!”

Hearing this sudden proposal from the man left me bewildered.

Suddenly, a man appears, claiming to be a remarriage partner, then suddenly tells us to live with these two girls in a room.

I had prepared myself for my mother’s remarriage but now questioned whether it was really okay, whether my mother would truly be happy, and whether I could really be happy with this decision.

Before I knew it, I found myself speaking to the man.

“Please give me until tomorrow to think. I’m shaken by the suddenness of it all. Earlier, I was okay with it, but now…”

“That makes sense. Take your time to sort out your feelings. We’ll come back tomorrow with the kids.”

“I’m sorry, really.”

“Don’t apologize. I’m the one asking too much of a middle schooler like you. Please forgive me.”

“No, no, not at all!”

“Thank you, truly.”

The man left with a charming smile, taking the two girls with him. My mother saw them out, but I remained frozen in the guest room.

This was how I met Matsuri, Ririka, and their father.