Love Is Indivisible by Twins

A love story between Risa Shiroki and Hiroto Fukami. Twenty year old Risa Shiroki comes to Tokyo from her hometown in the countryside to attend university. Pretty and popular with male students, she has never had a boyfriend and dreams of having a sweet love. One day, thirty year old Hiroto Fukami appears in front of her. He is business man who appears to be gentle and looks perfect. As romance blossoms between them, Risa discovers Hiroto's dark past.

In the world only the aristocrats have the power to fight the monster - mana. Even though Melida Angel was born in an aristocracy and studies at an academy developing mana users, she has no mana. To find her talent for mana, Kufa Vampir was sent to be her tutor but at the same time, he was ordered to assassinate her if she has no talent for mana. He makes a cruel decision to assassinate her because he thinks that it is a wasted effort that people who have not any mana are working hard in this world... However, he asks her, "Do you want to try to entrust your life to me?" He is not as an assassin nor a tutor. He is someone betting on his pride as an assassin tutor, to show the world what Melida is capable of!

Bee is a young lady trying to make her way in the world. She often acts before thinking, which can lead her into trouble (and adventure!). She also has a strong, nurturing personality, and doesn’t think twice about taking in Puppycat when he needs help. Although her laid-back-space-casey attitude and lack of skills tend to keep her from maintaining a job for long in the human world, she isn’t someone who easily gives up, and with the experiences she gains at the magical temp agency she stumbles on, she’ll finally have the chance to find out what she’s meant to do with her life.

The series is about an incident that takes place when the owners of the boarding house called 'Guest Summer Palace', which breaks stereotypes, and boarders with secrets gather to find Lee Seol who disappeared 13 years ago.