Since you are installing outside the Play Store, you must modify your settings:

Summertime Saga is a visual novel-style game that follows the story of a high school student who returns to their hometown after their father's mysterious disappearance. As you navigate through the game, you'll encounter a cast of colorful characters, each with their own storylines and quests. The game features a mix of romance, comedy, and drama, making it an engaging and addictive experience.

The most secure way to obtain the game is through its developer-sanctioned channels:

The latest tech updates (WIP 7159 to 7164) have focused on completing core storylines and modernizing the game engine:

The story follows a young student whose life is upended by the mysterious death of his father. Upon learning his family is in debt to shady criminals, he must balance school, social life, and saving money to secure his future. Key Features

This newer version features HD 16:9 art and better performance but currently has limited story content compared to the stable v0.20.16 version. Only download from SummertimeSaga.com or reputable mirrors like to avoid malware. Summertime Saga If you find the game difficult, you can search for a "Cookie Jar"