Mangas

ケロケロちゃいむ
From here: "Aoi was an ordinary boy until a wizard from the Land of Frogs, Makaeru, splashed magical water over him, turning Aoi into a frog. Makaeru then throws Aoi into a tree trunk, transporting him to the Land of Frogs. He is found by Princess Mimori, Makaeru's sister, and together they go on a quest to find the missing pages of the Magic Book that can remove Aoi's curse. For you see, when Aoi gets wet, he turns into a frog, and when he is dry, he turns back into a human..."
迷子のケモノ達, The Stray Beasts
Story about the love between a mermaid named Myuu and a demon named Jirou. This book has various oneshots about the two characters 
ねりんぐプロジェクト
By a shiny day, the older brother of Shunta, a potter, made a beautiful clay doll looking like a girl and called Nene. She was so cute that Shunta couldn't help wishing that she was a real girl... and then a miracle happened, the next day, Nene was alive, moving and creating living dolls by kissing clay dolls. So begins the life of Nene the doll, a shiny life soon disturbed by a strange inventor, creator of a male android.
天使向前走 -  P☆えんじぇる -  Mirai ni Kiss
* Contains a oneshot called Mirai ni Kiss - Meiko, a 14 year old Robotics genius, travels a hundred years forward in time. However, the future is completely different from her sweet daydreams.
ティンクル★ティアラ 前編
This is a story by the author of Kero Kero Chime, and you can tell. The characters look similar, though the plot seems different. Rupika lives on a far off planet called Rakariina and has a growth on her head that looks like a tiara(called the Twinkle Tiara). Her grandfather tells her that her destiny begins when she meets a man with the Twinkle Crown. Every so often on this planet, a lot of meteors fall and a lot of new aliens land on the planet. Rupika goes out to see this and maybe find 'her prince'(the Twinkle Crown) and is captured by a boy named Alpha, who then mentions something about someone named Rozeus. Rupika wants to see Rozeus and leaves Alphas's spaceship, which is actually a big turtle. The new aliens seem to know something about her tiara and start harassing her, and though Alpha tries to control them he gets knocked out. Rupika's situation turns desperate but suddenly a man with the Twinkle Crown appears.
ヴァージンリッパー