As a result of her "vigorous attitude", Ritsuka is known as the tomboy of Sakuraya police station. While on duty, she was accused of a cosplay scandal. Later on that day, she discovers a girl who was raped by an unknown man in the men's bathroom. With her fellow cops, she and two other policemen from the Criminal Investigation branch - Daisuke Takaya and Eiji Itsuki - attempt to find the suspect.
(Source: MU)

Collection of 5 stories:
1) Romantic Beauty
Since she's moving to a different town due to her dad's job, Yuka decides to confess to the popular Takigawa-kun during the Junior High graduation—only to be rejected and called a "fatso" in front of everyone! A humiliated Yuka becomes determined to turn herself into someone Takigawa will notice so she can realize her dream of having her first time with him. However, when a completely transformed Yuka goes back to her old home town for a school reunion, the person who calls out to her is...?!
2) The Queen and Her Slave
After drinking the night before, Ai wakes up naked with a stranger in her bed and no memory of how they got that way! She learns that not only has she lost her virginity but it's... to a sixteen-year-old high school boy?! When the young, but handsome Madoka offers to be her slave, Ai accepts and becomes his "queen"—much to the envy of her friends. But is there more than just a master-servant relationship here...?
3) Pure Love, Forbidden Love
Kazuko treasures her fond memories of her cousin and first love, Ryo. When she transfers to his school after being apart from him for 10 years, she races to reunite with the prince from her childhood—only to find him with one of his many "sex friends" in the student council room! It seems the boy Kazuko remembers as being so gentle and caring has changed! Or has he...?
4) The Days When I Yearn For Love
Mochida likes Aoyama but has a hard time speaking to him normally. Because her class recently changed seats, she now sits next to Aoyama. Will she be able to open up to him before they change seats again?
5) The Warmth of Your Fingertips
While on the train, Yuna's classmate Yuasa protected her from a pervert. Yuna felt really happy but lost her chance to thank him. Although he is a quiet guy and may look angry, he continues to protect her each time on the train. Is there something more to his actions?
(Source: M-U)

Uri was just a normal, average female high school student, but, one day, she suddenly got three older brothers!! Not only that, but they are all extremely handsome?! Surrounded by big brothers like that, who will be Uri's first love...?!
(Source: Midnight Scans)

In the Beast Harem series:

Volume 1: Rakuen Danshi -
Youko is a normal high school girl attending a not so normal high school. You see Youko's school used to be an all boys school, so after transferring to this school she is the only female in her class, and that surely can cause a few problems! She is being constantly teased by her classmates, especially by Mastsushima Soushi, who she hates the most!But not everything is bad, Youko is in love with Narumiya Kouei, the only one who helped her since she entered the school. But if the one Youko loves is Narumiya, why does she finds it so hard to stay away from Mastsushima, who she 'hates the most'?
- From Aka Roze Tenshi

Volume 2: Gokujou Rakuen Danshi -
Youko and Soushi start dating. However, summer break is approaching, and Youko has to be separated from Soushi. Not if Soushi can help it. he is working with Narumiya to save up for their summer vacation hot spring trip. Yet, shadows are coming to destroy the couple's love. Will this love rival succeed? Or will Youko and Soushi' relationship survive and have their first time?

Volume 3: Jun'ai Rakuen Danshi -
Youko and Soushi are on their lovey-dovey vacation. There, they meet Narumiya and his famous girlfriend. Youko prepare to give her first time to Soushi, find it extremely hard due to sharing a bedroom with friends and the pain. Upon seeing Narumiya and his girlfriend together, Youko grow worried. Will Soushi and Youko have their first time at the hot spring? Or will Soushi get tired of Youko's immatureness and end their relationship?