Do not confuse with Gaccha Gacha (aka: Gatcha Gacha). 3w6l6c

For the specific arcs (and their associated releases), look under the "Related Series" field.

PART ONE - Gacha Gacha - Capsule (VOLUME 1-5)

Nanjou Kouhei and Hanazono Clara have been childhood friends since elementary, and now in their high school years, Kouhei has begin to take a liking for his childhood friend. However, after an uneventful summer vacation, Clara began to act differently. Sometimes turning extremely "horny" while becoming pure and innocent at other times. Soon, due to certain "accidents", Kouhei is forced to help our Clara whenever she "changes". What will become of Kouhei's high school life as he tries to help his friend and win her heart?

PART TWO - Gacha Gacha - Secret (VOLUME 6-16)

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.