Ah, high school. Is there any better place to start fresh after a horrible middle school relationship? Nope! Not unless your ex ends up at the same school as you and is now your stepsibling. What was supposed to be a sanctuary of peace where I could avoid ever seeing her again has become a living nightmare! Everywhere I look, I see her—in my house, in my school, in my class. There's no escape! She even claims that she’s the older sibling. Like hell she is! But I won't lose to her. After all, I'm the older brother in this new family situation. That’s right, we’re family now. No matter how much we may have thought we loved each other before, we saw one another’s true colors and realized we weren’t meant for each other. That’s why even though we may keep up a buddy-buddy sibling act for the sake of our parents, things will never go back to the way they used to be. (Source: J-Novel Club)

My role is to take care of her—and to deduce "her deduction." "I shall prove the truth that you have found." An assistant to the high school counseling teacher, Rinne Akegami is an introvert who only understands what is true. As if from a revelation from God, she can point out the culprit of any crime there. What complicated matters, however, is that not even she herself understands how she does this! This is where Touya Iroha comes in—he deduces "her deductions" in order to reveal the truth, once and for all!

Ah, high school. Is there any better place to start fresh after a horrible middle school relationship? Nope! Not unless your ex ends up at the same school as you and is now your stepsibling. What was supposed to be a sanctuary of peace where I could avoid ever seeing her again has become a living nightmare! Everywhere I look, I see her—in my house, in my school, in my class. There's no escape! She even claims that she’s the older sibling. Like hell she is! But I won't lose to her. After all, I'm the older brother in this new family situation. That’s right, we’re family now. No matter how much we may have thought we loved each other before, we saw one another’s true colors and realized we weren’t meant for each other. That’s why even though we may keep up a buddy-buddy sibling act for the sake of our parents, things will never go back to the way they used to be. (Source: J-Novel Club)

My role is to take care of her—and to deduce "her deduction." "I shall prove the truth that you have found." An assistant to the high school counseling teacher, Rinne Akegami is an introvert who only understands what is true. As if from a revelation from God, she can point out the culprit of any crime there. What complicated matters, however, is that not even she herself understands how she does this! This is where Touya Iroha comes in—he deduces "her deductions" in order to reveal the truth, once and for all!

The older brother, imprisoned by his sister, dies just as he escapes and is reincarnated in another world! He thought he had been freed from his demonic sister, but now she too has been reincarnated in the same world...?

Orimi Kiminaga, a struggling student whose prohibited part-time job was discovered. To avoid expulsion, he ended up doing housework at the Board Chairman’s residence—but in that Kichijoji household lived four beautiful sisters with talents everyone admired! The artist VTuber eldest sister Kikuri. The popular streamer second sister Lanka. The Pro Gamer third sister Umeru. The genius voice actress fourth sister Takenana. However, instead of talent, their daily lives were free-spirited, with Delivery meals, underwear left lying around, and before he knew it, they were sleeping in the same Bed as Orimi!? While being bewildered by the sisters’ “True Faces,” Orimi gains their trust through his housework skills, until he receives a single Message. “You’ll choose me again this time, right?” Under one roof, the fate surrounding the four sisters begins to move!

The need for detectives has dramatically increased in response to the increasing number of violent crimes. This year, a boy and a girl enter Marimine Detective Academy, an ultra-exclusive school, and the only one in Japan that offers the "National Detective License." The boy is Misaki Fujisaki, the grandson of the man who was once known as the "Crime King." The girl is Shia E. Hazeldine, the adopted daughter of the man known as the "Detective King." These two descendants of sworn enemies will meet each other by chance! And as their school days begin, an incident occurs right from the entrance ceremony!? Moreover, for some reason, Fujisaki's score is higher than Shia's, even though she supposedly solved the mystery first... "I challenge you!" "Don't regret this, princess." This is a unique academy story where students compete to find the truth. This is intellectual excitement at its highest peak! (Source: MFBunko J, translated)

The criminal is a witch. The trick is magic. In the middle of a festival, a girl disappeared into a sea of flames. This was in a locked room under the sight of many and furthermore, it was an imitation of a thousand year old legend. Rookie knight Werner and Witch Hunter Ludovika challenge this incident. However the two of them were not aware --of the long history that lays behind the incident. And to make matters worse, they are hindered by the inquisitor Ersilia. The two old friends, as well as natural enemies are bound by a certain tragedy-- The girls' obstacles, an incident made up of magic, a mystery that has been left unsolved for a thousand years. And when lies are brought to light, the boy will find true justice. (Source: Amazon, translated)

Kiminaga Orimi is a struggling student who has been caught working part-time in violation of school rules. In order to avoid expulsion from the school, he is assigned to do housework at the Chancellor's house... The Yoshijoji family is home to four beautiful sisters, each with her special talent! The eldest, Kikuri, is an artist and VTuber. The second girl, Ranka, is a popular live-streamer. The third sister, Umeru, is a professional gamer. The fourth, Takenana, is a genius voice actress. But despite their talents, the sisters are lazy in their daily lives, eating takeout, walking around in their underwear, and falling asleep in Orimi's bed!? Orimi is troubled by the sisters' “real faces” at first, until he gains their trust with his skilled housework. But then he receives a secret message… “You will choose me again, won't you?" Under one roof, daily life with the four sisters is about to unfold! (Source: Kadokawa, translated)

The need for detectives has dramatically increased in response to the increasing number of violent crimes. This year, a boy and a girl enter Marimine Detective Academy, an ultra-exclusive school, and the only one in Japan that offers the "National Detective License." The boy is Misaki Fujisaki, the grandson of the man who was once known as the "Crime King." The girl is Shia E. Hazeldine, the adopted daughter of the man known as the "Detective King." These two descendants of sworn enemies will meet each other by chance! And as their school days begin, an incident occurs right from the entrance ceremony!? Moreover, for some reason, Fujisaki's score is higher than Shia's, even though she supposedly solved the mystery first... *"I challenge you!" "Don't regret this, princess."* This is a unique academy story where students compete to find the truth. This is intellectual excitement at its highest peak! (Source: MFBunko J, translated)