Housuke Nojiri: 3 books

Aki Shiraishi is a high school student working in the astronomy club and one of the few witnesses to an amazing event--someone is building a tower on the planet Mercury. Soon, the enigmatic Builders have constructed a ring around the sun, and the ecology of Earth is threatened by its immense shadow....

Yukari Morita is a high school girl on a quest to find her missing father. While searching for him in the Solomon Islands, she receives the offer of a lifetime--she'll get the help she needs to find her father, and all she need do in return is become the world's youngest, lightest astronaut. Yukari...

When the Rocket Girls accidentally splash down in the pond of Yukari Morita's old school, it looks as though their experiment is ruined. Luckily, the geeky Akane is there to save the day. Fitting the profile--she's intelligent, enthusiastic, and petite--Akane is soon recruited by the Solomon Space...