When I woke up, I had been reborn as a baby. My mother passed away and I was neglected by my father. Even though I was born in a Marquis family, my life started on HARD MODE. But I won’t be discouraged. I will eat well, sleep well, move a lot, get whatever I can get and live happily.

But for some reason, a lot of incidents happen. This is a story of a little girl with the power to create barriers in a world where the Hollows and Humans are in conflict. She gets other people involved in those incidents and becomes happy.

Web Novel: https://ncode.syosetu.com/n2421eu/

From MangaHelpers:
Sawamura Soushi is a soldier in a war-torn future. He meets a cute, innocent young girl named Nadeko, with whom he starts up a friendship. Nadeko is a flower girl, one of the girls who has a flower growing from her heart. One day, when Sawamura is trying to protect her from danger, she confesses her love to him and protects him with the plant growth that suddenly comes forth from her body.
Sawamura soon learns that there is a special squad of flower girls and their partners, and that their abilities are awakened when they fall in love. But does he really love a girl that is a decade his junior, and will he be willing to be a good partner for her? What's more, he learns that the awakening also starts the growing of the flowers in their bodies, so that the flower girl soldiers have only a short while longer to live. How can Sawamura and Nadeko make the best of such a terrible situation?

From Yen Press:

Discharged from the hospital after recovering from a serious accident, music teacher Hibiki Kyousuke finds himself able to see and hear musical notes coming from the people and the world around him! As he contemplates this lasting damage (and maybe a malpractice suit against the hospital), he finds himself face-to-face with a haughty young girl decked out in frilly Gothic Lolita clothing. And when she suddenly points at him and orders him to be her servant, will Kyousuke have no choice but to dance to the little princess’s tune?!

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From FairGame:

"Live with Sincerity" is Natsuki Taiyou's motto. It's the first day of high school, Taiyou was heading to school and then he meets Hinata during the way there. He fell in love at first sight and suddenly confessed to her. Her answer was yes but then she ran away without saying who she was, but it turns out that she was his classmate. Taiyou felt a destiny between them. However, on the next day, she doesn't remember who he is. Why could that be...?