If you're looking for manga similar to Boku no Inochi wo Ageru. Episode 0, you might like these titles.
With a secret purpose in mind, Yuna begins a new job at a dorm for a special school. What she didn't sign up for is a peculiar game played by the students there! As the new target of her fellow dorm members, Yuna is forced into the role of brand-new plaything but as much as she wants to leave, a certain deal with the president of the school keeps her from escaping her predicament...
Why are guys so useless!? Nene is a high school student who is sick and tired of her male classmates constantly acting like children. Still, she hopes that she might one day fall in love like everyone else. It's when these thoughts are going through her mind that she bumps into Yusuke; a good-looking and popular senior...A love story between a senior who's a little short in the sensitivity department and a girl who likes things crystal clear.