If you're looking for manga similar to Ask Dr. Rin!, you might like these titles.
Akko and her mother have been living together since their father became the captain of a luxurious cruiser. One day, Atsuko accidentally broke her favourite mirror. She made a grave for it. On the same night, the sky brightens and Akko recieves a gift, a compact mirror, from the mirror spirit for her kind-heartedness. Whenever she sings the magic words, the magical compact mirror will alow her to transform into anything she hopes to be.
The more Wedding Peach and her friends Yuri and Hinakiku discover about their new-found magical powers, the more Rain DeVilla and her evil henchmen vow to destroy them. In the never-ending battle between love and hate, three young girls are the world's last line of defense against the onslaught of evil.
In a magical part of the galaxy, the prince of the Tambourine star world has been betrothed to marry one of two princesses; but Comet, the princess of the Harmonica star world, couldn't care less. Thus, much to her dismay, when the prince flees to Earth to escape his fate, Comet is sent to find him and return. Now, with the power of the stars and a magical locket, Comet sets out on an adventure to find the prince, have fun, and experience the life of an earthling first hand!
Chocolat is an extrovert and an assertive girl, while her friend Vanilla is extremely shy and hesitant; together, they both come from the Magical Kingdom and are the next candidates in line for the throne. In order to qualify to be the Queen, Chocolat and Vanilla are sent to the Human World to improve their magic; the assessment is based on capturing the most 'hearts' of the people in the Human World. Chocolat's upfront behavior was popular in the Magical Kingdom, but in the Human World, people prefer the personality of her newly formed rival, Vanilla. Now, Chocolat must work extra hard to live up to her mother's failure -- all while repressing her desire to whup everyone's butt!
A strange girl transfers to Mitsuba Elementary School. At first glance, she is a normal student. However, she is a great athlete and can talk to animals. According to her, she is the 33rd descendant of the great ninja, Sarutobi Sasuke. Furthermore, her dog, Puku, can talk.
Hime-chan was a normal girl who had all the troubles of that age. Even though she had a tomboy nature, she envied her older sister's beauty and had a crush on an older boy. She dearly wished, as many do, for something to give her the chance to grant her wishes. Soon, something did. Hime-chan came into possession of a magic ribbon, that gave her the power to change into anyone she wished. With that, she transformed into her sister - but found out a few things that she wasn't prepared for.
It is spring, with cherry trees in full blossom, and Sakura is just entering middle school. Her beloved Syaoran has returned from Hong Kong, and life couldn't be better. But when she awakens from a strange dream to find her Sakura Cards powerless, how can she protect Tomoeda from disaster?!