Kono Naka ni Hitori, Imouto ga Iru! (Light Novel) - Recommendations

• Vol: 11
• 2009 - 2012

Taketo Akutagawa attends a school for geniuses: Inspiration Academy Private High School. Taketo is a genius novelist and writes erotica. Despite negative perceptions many people have of him, he aims to be at the top of his class and be recognized as the world's greatest writer.

• Vol: 22; Ch: 171
• 2012 - 2018

A private high school that brings together "saviors," youths with awakened memories from past lives. Some of them are Shirogane who fight enemies with weapons and techniques gleaned from the Prana powers from their own bodies. Others are Kuroma who wipe out enemies, with magic to manipulate the Mana powers that surpass physics. A boy named Moroha Haimura enrolls in this school. He is the first person in history with past lives of both Shirogane and Kuroma.

• Vol: 11; Ch: 145
• 2009 - 2015

Hasegawa Kodaka has transferred schools, and he's having a hard time making friends. It doesn't help that his blond hair tends to make people think he's a delinquent. One day, he runs into his bad-tempered solitary classmate Yozora while she's talking animatedly to her imaginary friend Tomo. Realizing that neither of them have any actual friends, they decide that the best way to alter this situation is to form a club and start recruiting. That is how "Rinjinbu" was formed, a club specifically designed for people who don't have very many friends. As other lonely classmates slowly join their little club, they'll try to learn how to build friendships through cooking together, playing games, and other group activities. But will this group of relationship-challenged misfits really be able to get along?

• Vol: 7
• 2009 - 2011

A high school senior named Yotaro thought he was an only child — until he met his real mother and discovered that she has 19 daughters, from 0 to 18 years old. He ends up living with his "true family."

• Vol: 11
• 2012 - 2016

The story begins with Blaze — a weapon that is the manifestation of a human's soul. Thor Kokonoe happens to be qualified for this, but for some reason his Blaze is not a weapon, but a shield. Moreover, he enrolled in a school that teaches combat skills, and thanks to the school's Duo partner system, he ends up living with a beautiful silver-haired girl.

• Vol: 13
• 2012 - 2016

Kanade Amakusa is a high-school student who is suffering from a curse called "Absolute Choices". This curse requires him to select an action from a list of two or three options that appear before him at any time, and has no control over what choices appear. Many of them are weird or perverse and as a result, the curse has tainted his reputation with his classmates and other people around him, making his life very difficult. However, one day, a choice he makes on his way home from school causes a mysterious, beautiful young girl to fall from the sky. Amakusa discovers that she was sent from the God World to assist him in completing a series of missions given to him directly by God himself. After completing these missions, the "Absolute Choices" curse will be lifted from Amakusa; but should he fail in completing any of the missions, he will be stuck with the curse forever.

• Vol: 13; Ch: 120
• 2012 - 2017

The life of Tomoyo Aki, a highschool otaku working part time to support his BD hoarding. With remarkable luck, he bumps head-first into, Megumi Katou, the most beautiful girl he has ever seen. Naturally, the meeting twists his life into a complicated torrent of relationships. Eriri Spencer Sawamura, his half-foreigner childhood friend who's always valued her relationship with Tomoyo. Kasumigaoka Utaha, a cold, composed renowned literary genius who shoves everyone aside from our protagonist. What is this? An eroge introduction?

• Vol: 15
• 2013 - 2017

With the sudden appearance of the monsters that came to be called dragons, the world had completely changed. Before long, supernatural girls with the power of the dragons, called "D", were born within the human race. The secret existence of the only male "D", the boy Mononobe Yuu, was forcefully thrown into the school where the girls of "D" gathered - Midgard, where he saw the naked body of one of the students, Iris. Furthermore, upon meeting his long lost sister Mitsuki, Yuu seems to have been enrolled into this school...!? "When there's really no other choice, Iris, I will—kill you." "Can I really... believe you?" The curtains open as the "one and only story" about the boy who was supposed to become the strongest assassin and the poorly performing girl unfolds—! Unlimited School Battle Action!

• Vol: 12; Ch: 54
• 1999 - 2003

Wakura is so confident of getting into his chosen high school that he stops taking his tests. Unfortunately, he gets every question on his entrance exam wrong, leaving him to be thrown into a truck, put on a boat and then taken to Promised Island. There, he finds out that he was entered, by recommendation into a high school, not to mention he has twelve adopted sisters on the island that will be attending with him! More than anything Wakura wants to get off the island and get back to his old life, but eventually his sisters help him feel welcome. Together, Wakaru begins his journey of living and growing up with his twelve cute sisters.

• Vol: 3
• 2015