Mikio teases his neighbor Mariko a flat-chest and she calls him a midget. When one day Mikio turned miniature and ended up in Mariko's care, they discover how wrong they are about each other.

Just after being dumped by his girlfriend for being wishy-washy, our hero meets a high school girl... with dog ears? Is she a dog? A human? She's wide open, rather naive, and with her around, it's just one crazy day after another. Romantic comedy author Hiroyuki Tamakoshi, author of "Boys Be", brings us the unlikely love story of a hopeless office worker and the extraordinarily beautiful girl who lives with him. Take care of your doggy!

(Source: MangaBox)

Do not confuse with Gaccha Gacha.

Lately, Kouhei can't get his friend Kurara out of his mind. Even though he has known her since elementary school, all of a sudden, ever since she came back from summer vacation, he has been crushing on her . . . hard.

But something is different about Kurara-she's acting very oddly. Sometimes she seems wholesome, pure, and innocent, and at other times she is extremely forward and unabashed. Kouhei soon learns that Kurara has multiple personalities-and decides to help her keep her secret from their classmates. But Kouhei finds himself struggling between helping Kurara as a friend and trying to win her heart . . . which is a challenge, since she has many!

Volumes 1-5 are the first story arc. Starting from volume 6, a whole new set of characters take the story off in another direction. Because of this, the chapter numbers were restarted back to 1 for the first chapter of volume 6.

From Taruby:
There are two stories, "Capsule" and "Secret", so far in the GachaGacha series. This summary is about the 6 volumes of the"Secret" story arc.

Hatsushiba Akira, an awkward senior highschool boy, has a strong crush on classmate Sakuraba Yurika. But when he gets close to her he always says or does something stupid.

At the suggestion of his best friend, Kikuchi, Akira enters the GachaGacha machine to play a game, but the machine fritzes out and malfunctions. That night he sneezes while going to bed, and when he wakes up he looks like the female avatar he saw in the GachaX2. He soon learns that sneezing will change him back and forth from his normal self to a female form. As a girl, Akira-chan is able to get close to Sakuraba and become her friend.

From the Animeraider:
Have you ever read a manga and thought to yourself, "Why the hell did he do that? It's not what I would have done. I could do better!" Well, now here's your chance. This manga changes storyline depending upon choices you, the reader, make. Have fun!

The story follows Haruo, who one day loses his wife, Hinata, in a car accident. Heart-broken, he returns to the boarding house where his wife once lived, wanting to care for it in honor of her memory. This proves a difficult task as the current owner of the premises, his former sister-in-law, holds Haruo responsible for Hinata's death.

(Source: MangaDex, edited)