GANMA! is a manga app that updates with serialized original manga every day. It has surpassed 17 million downloads. The app offers a wide range of interesting manga, including popular original series such as "Yamada-kun and the Love of Lv999," "Shishihara-kun with High Girl Power," "Is it a Landmine? Mr. Chihara," "Nanase-san's Abnormal Love," "Yonezawa-san Who Wants to Quit Being Human," "Numerous Deficiencies," "Reset Game," "The Loose Screws in Everyone's Head," and "Intestines and Nose." These manga cover various genres, from suspense, horror, romance, and comedy to battle manga and other attention-grabbing genres like isekai and supernatural abilities. The app also features guest manga publications in addition to the original manga.

One of the standout features of GANMA! is that all the ongoing original manga series are available for free, from the first chapter to the latest one, without any charges or restrictions. The app offers a diverse range of manga genres, ensuring that there is something enjoyable for both male and female readers. Additionally, GANMA! provides monthly guest publications of manga that the readers would love to read. The app can be installed and accessed without the need for membership registration.

In terms of functionality, GANMA! allows users to post hand-drawn illustrations and artwork, as well as comments and heart-warming support for the manga. The readers' support and evaluations contribute to the ranking of the manga, which changes periodically. Users can also support the original manga by sending items, and the support given to the authors is reciprocated accordingly. However, it should be noted that some original manga content may not be eligible for support. GANMA! Premium, a paid subscription plan, offers the advantage of reading the next chapter of ongoing manga before its release, as well as unlimited access to all manga, including original completed series and guest publications, without any advertisements.