"Oh, my respected older brother... it seems like you're getting fucked up by this situation?" During the almost setting sun, I got a rude remark from my younger sister who was hundreds of years older than me. "Without you saying it, I already know that I'm getting fucked up this time," I replied while taking the grade report paper that had been issued by the high school that had accepted me as an outstanding student in it. "I think, besides being fucked up, you will also be on the verge of death after being in the same class as me. You know that the class you will be attending is filled with future S-rank candidates. How could you enter the S-rank candidate category with an ability that is still unknown like that." "Oh, my sweet younger sister, please don't make your human older brother lose his enthusiasm after the feeling of happiness and being fucked up appear at the same time." "Shouldn't this be celebrated after my great older brother was able to enter the S-rank class with satisfactory grades... even if it's only aimed at the part of understanding tactics and supporting magic proficiency." Skkuuuttt!! "Ugh!" in the middle of my younger sister's words that slapped reality. I could only feel the pain from an invisible arrow that flew through my chest. In a world that has changed drastically like this. I was born too early to explore the ocean and too early to explore the complicated universe. At this very moment, my world too quickly accepted an abnormal change brought by the emergence of a gate that connected different worlds to this world. The earth that should have been a large continent that spread the plains by moving its tectonic plates now has to face a logic that deviates from the word normal, a concept of magic. Something has happened to this earth and caused my household to experience a unique incident where my cute younger sister is a Succubus known as a creature that often sucks dry a man's sexual desire with her magical abilities. That made me have a new regret. Why was I born when the world became strange like this? The concept of magic and the concept of modern science mixed together because of the emergence of a gate that connects the other worlds so I have to bother studying the concept of magic! They are bastards! Suddenly appearing and giving a new life goal to every creature that is mixed unclearly in this world with one goal, like to complete the "Tower of Fate" that is currently in front of my world. Whether the world has changed too quickly or I am too slow to adapt, I have to be slapped by reality again if my father who is a widower has to remarry a Succubus Widow and get a Succubus younger sister like this. "Uuugghh... it would be better if I entered the B-class candidate rank or lower than that," I muttered tiredly. Ckrriikk... With my face hanging down and filled with tiredness, I found my younger sister taking my photo. "Hey, don't take this photo of your older brother without permission, you will post it with a lewd title later, right?" "You already know about it but still look down like that. Why not just do this, our parents will be happy with their two children who have the potential for S-level combat power." "Your lips are so easy to talk to after seeing the grade report paper given by the examiner at our school. How could I get an S-class recommendation with poor attack magic ability, questionable defense magic ability, and only excel in magic support!" grumbled a little feeling annoyed to the point of crumpling the grade report paper that had been given to me. "Of course this is different from you who have a grade far above me," I continued with my annoyance that was starting to subside. My younger sister just moved her Succubus tail and played with her smartphone as if she were looking for a lewd title that matched the pose of the pathetic photo of me that she had taken. This annoyance that had subsided disappeared after being ignored. I kind of vented my frustration at being in class S-rank. I mean... what kind of crazy person would think that a support ability with a value reaching the S-rank behavior scale would get him a recommendation to attend class S-rank which is filled with aspiring monsters who have the magic to develop even further beyond the S-rank level cap. Even just sitting in that S-rank class, I wouldn't be able to withstand the mental burden given by them and one of those monsters is my younger sister. Put aside her appearance which has big breasts and a beautiful face that is tempting as the main specs of a Succubus girl whose main task is to squeeze men's lust dry. She is also a Succubus who can cast spark magic that is equivalent to a temperature of 100 degrees Celsius. I can't believe that the sparks from her magic chant alone can make me a cup of coffee in just a matter of seconds. That already makes my mind crazy, let alone the other monsters who will nest as my classmates later! "Come on, don't feel upset like that. I'm sure they also have high hopes for my reliable older brother," with a tone that sounded indifferent and her fingers were typing something on her smartphone, I got an answer that made me even more aware of my low abilities. "On the other hand, I'm quite happy to see my older brother enter the same class after we went to different middle schools before. I just moved to this world... wouldn't it be better for us to become closer as an older brother and younger sister who are tied by family ties," My younger sister directed her gaze at me. Those red eyes were filled with the shadow of me who was looking down dejectedly with the sun that was almost setting down. On an outdoor bench near our house, I used up a little of my energy to complain after succeeding in suffering. "Oh, I'm sorry," I said to apologize to my younger sister who felt unfamiliar with this situation. Because of my condition of not wanting to accept reality, I almost forgot that my younger sister deliberately came to this world to meet me who had become her older brother from the human race. Although if you think about it with normal logic, she should be an older sister because she is hundreds of years old. However, after converting to human age, she is a year younger than me and makes me her older brother. It sounds strange and unusual indeed, but that's what's happening in this world. It's normal for the human race to marry another race that comes from the gate that connects the two worlds. My younger sister gave me a sarcastic smile to tease me. "If you feel guilty about this, wouldn't it be better to call me by my name from now on instead of saying... Oh, my cute younger sister. Honestly, it makes me feel disgusted when I hear it." Skuurrttt!! Another invisible arrow hit my chest. This bloodless pain made me realize that we felt like strangers to each other. "That's right," I replied with a heavy sigh. "I even forgot my own younger sister's name," I continued my words which suddenly got a small pinch from my younger sister's hand. Srreett... "H-Heyyy... I-It hurts..." Holding back the small pinch from my younger sister's hand that pulled my cheek, I looked like a pathetic man after getting treated like this. "Remember my name properly and call me by my name starting today!" said my younger sister while giving me a cold stare that pierced my chest. The threat from a monster who has an S-ranked combat power feels different. I even felt goosebumps after getting a small threat to remember her name and call her name. "I-I understand... Uhh... M-My cute younger sister." Srreettt... With that statement, my cheek was pulled again until the pinch turned into a painful stab with her nails which now left a cut mark on my cheek. "Eiittatatata!! H-Hey! Too deep!! Your nails have scratched my cheek!" my little scream seemed to have made the wrong decision after forgetting my younger sister's name for so long and calling her like a stranger who lived in the same house. "Hmph!!" My younger sister snorted and released her hand from pinching my cheek. My cheeks which felt red and starting to swell looked like they had been stung by a bee needle. "You're too much, Momoka," I said, now remembering the nickname of my cute younger sister or what I know better as Momoka. "Hmph! You better not forget my name again, Weiss!" Momoka grumbled, now looking happy when her name was called. When the sun had set, night had come with the light of the moon that had just woken up from its sleep. That's make me stood up and extended my hand to Momoka. "It's time for us to go home and keep my embarrassing grades a secret, Momoka." "If you give me a gentle kiss on the lips, I'll keep my mouth shut." We both just smiled when this one joke was said by her. A joke that sounded dangerous and my instincts began to struggle not to get involved in physical contact with Momoka who was my own younger sister in the legal family ties between our parents who were in a household love. My outstretched hand was immediately taken by Momoka and we started holding hands. "Still afraid to kiss a girl's lips? No wonder you're still single now. At least act like a manly man who dares to kiss a woman's lips just because her breast size is big than average human girl." For some reason, it made me deja vu when my father and I were on vacation to Japan. A vacation that accidentally made my father remarry after seeing a Succubus woman with questionable breast size. "I'm not like my father who can express his love freely like that," I replied while enjoying the journey home after realizing that tomorrow would continue. "Heh, loser," Momoka quipped with a smile that stabbed my chest. "Tell that to a Succubus who is still a virgin at her current age," I replied with a quip that made Momoka's body tremble and her Succubus tail sway. "What's wrong with a Succubus who is still a virgin? That proves my body is much purer compared to a Saintess who claims to be a holy girl but plays around with a man without everyone knowing." "Don't make accusations about a case that has already happened!" I said to stop Momoka's joke about a case that had happened to the point of being on the television news lately. On my way home at night like this, I should be afraid of a surprise attack from street thugs. However, with Momoka's previous statement, I was more afraid of her freely uttering her baseless little accusations involving a sensitive case that was in the spotlight of the public eye. Whatever conspiracy is going on, at least I don't want to get myself involved in a conflict that will get me into trouble? Oh, my poor self, at least realize that you are weak and not the main character of a heroic novel.