Domina No Do! manga

A young boy is saved by a mysterious gunfighter who uses magical bullets. She is the greatest magician in the world but disappears shortly after saving him. Having fallen in love with her, he trains to become a gun fighter and ten years later, his search comes to an end but his adventure has just begun.

From VIZ:
Kurohime is a buxom witch with the power to control magical guns. She once made the mistake of challenging the gods and was cursed for her foolishness! Transformed into a little girl named Himeko, she can only regain her former body and powers when she falls in love. But finding love in a world fraught with evil is no easy task.

IMPORTANT!! Read chapters with a #2 near them after Volume 2 Chapter 5

Fourteen-year-old Kouichi Hayase�s life has always been a mediocre one, if not dismal. However, those days of being bullied by classmates and escaping to a fantasy of being a hero are put to an end when a certain �accident� bestows on him a girl and a gigantic humanoid robot called �LINEBARREL�. The extraordinary power that Kouichi obtains puts him and everything around him on a sudden rollercoaster ride of battles, intrigues and friendship! During the course of his adventure, the boy starts to learn what life has to offer; he meets new friends, bids farewell to the old ones, but most of all he now has considerable responsibilities and is forced to confront the world around him.

Hiromi can't wait for her cousin Makoto to come live with her - but when "he" finally shows up, she gets a good deal more than she bargained for. Toshiki Yui turns a hentai fetish into the plot hook of this high school situation comedy.

Ever since he was a young child Sora Aoi had always exchanged words of "I love you" with his older sister Aki. Now, as he comes of age, he finds it much harder to exchange such comforts as they did in those simpler times. When Aki demonstrates her feelings toward him to go beyond a sisters love Sora finds himself questioning his feelings for his sister. Realizing their affection for one another they consummate their love in secret.  In a society that would never understand, they must now keep their love a secret from their family and everyone they know. With a boisterous twin sister and friends that want to be more than just friends, Sora will find it wont be so easy. Hormones raging, you can be sure that Itosugi Masahiro's "Aki-Sora" will be a sure-fire drama that you don't wanna miss!
Warning: Nudity and graphic situations!

Plot: Tachibana Sango is a poor student looking for a decent place to stay on a shoestring budget. When it appears that he has found the perfect place, it turns out to be anything but, as his new roommates, a trio of young ladies, seem determined to run him ragged and make his life miserable.

An Ordinary kid Shinta likes to play with cats even though he cannot have one for a pet because of his father's allergies. Cats also like to play with Shinta... in more ways than one. For example, changing into a girl and becoming Shinta's girlfriend and generally trying to get him to reciprocate their catcalls, literally.

Yuuki kun was one of the star players on his junior high school team; along with his childhood friend Shinichi. Due to a promise that he made with his female childhood friend Miyuki, Yuuki kun has decided to take the long road to the J League by joining a normal school club and winning tournaments, instead of taking recommendations like Shinichi did....

When he checks the club of his selected school, the best club in the country; he quickly notices that the club is completely devoid of any members except for a weird girl that goes by the name of the Fujisaki Rin. She along with her friend Ayane seem to have driven everyone out of the team....

But is it really that Rin and Ayane want to dissolve the soccer club? or could they possible want something else??.... And just what is exactly the promise that Yuuki did with his childhood friends? Well, regardless of the answers it seems that Yuuki isn't in for a smooth sailing, as he completely seems to have fallen into Fujisaki's hands...

The day a young boy was born was the day that the legendary thief died. The many battles that revolve around the treasure left behind by him. Here, the curtains are pulled and the story starts.
Manga released up to Volume 9. Completed.
(Taken from the back of the book.)

After his mother died, a 15-year-old boy named Taro is invited by his grandfather to the Hanaukyo mansion. Soon after he arrives, his grandfather disappears, and Taro learns that not only will he inherit the unbelievably huge estate, he will also have access to the countless beautiful young maids working there.

A new teacher enters an all-girls high school and as he tours around he sees a female student sleeping in a classroom. When she wakes up, however, she suddenly kisses him...