If you're looking for manga similar to WATATEN! an Angel Flew Down to Me, you might like these titles.
One day when running to high school, Mimika spotted a young girl playing with a cat. The young girl instantly captivated her, so she approached her and in panic stated that she was not a suspicious person. The young girl ran away. Later Mimika noticed that she dropped her wallet and went looking for it. The young girl sees this and helps her look for it. So begins Mimika's friendship with a elementary school girl.
Ikeda Mitsuko is a successful business woman, who made a wish to Santa to have a wife. And here it fits the phrase "Be careful what you wish for..."
The development of a gentle, warm relationship between a bookstore owner and a high-school student
26 year old Amane is still getting over the bad breakup she had with a girl named Yuki back when she was in high school. One day, she bumps into a high school girl who looks exactly like Yuki and bursts out in tears. This high school girl, who is named You, takes Amane out for lunch to try and help her feel better. As the two grow closer to one another, feelings begin to stir in both of their hearts, but will they be able to overcome the burden Yuki has placed upon Amane?
7 years have passed by and she encounters the boy who loved her, but she doesn't know that he's actually a woman.
Hachinohe Akemi is a single, 30-year-old woman who works at a Japanese confectionery shop. After she helps out 15-year-old Nikaidou Shion who works part time at a local convenience store, Shion starts showing up at Akemi's workplace, but how will Akemi respond when Shion says she likes her?
Harii Noriko is a pretty and smart 17-year-old high-school student. After the meeting with Rhiana Alkanet, a 10-year-old witch who just moved in next door, she began to notice a whole new side of herself which she was unaware of. And so did Rhinana. This is a story about their hilarious and romantic advantures together.