With his phrase "don't you dare make girls cry," Makoto Tobita has failed his 30th confession, but that won't stop him. Promising to do anything for the girl who smiles at him, no matter what it is, what will happen now when the alien fighting - giant girl, Mana Eimiya, is in love with him?

Kagami Junichirou was known as a physics genius when he was a teenager, and he was even published in "Nature." However, after college, he suddenly lost all interest in science. As a NEET, he's devoted himself to his anime blog and nerdy collecting habits. He claims he has a serious illness called "I can't do anything I don't want to do." Desperate to get him to do something with his life, his little sister manages to get him a job teaching physics at his old high school. He's certainly an unconventional teacher, but he becomes fairly popular with the students. After helping a girl who's being ruthlessly bullied, Kagami finds that he actually likes teaching. Will he continue his career as a weird teacher? Will he go back into physics? Or will he end up back where he started?

(Source: MangaHelpers)

Yotsuba Mitsuru, the day before his 17th birthday, is dumped for the 30th time. Remembering a promise with his best friend, who shared his birthdate, made 10 years before, he goes to the park to meet him when a flash of light knocks him out just as he thinks he sees his friend. He awakens in the hospital and discovers he's been given a second chance at life... with a few strings attached.
(Source: MU)