Events I Love You, Brother take place in an ordinary Japanese family. Adults go to work, and two sons attend school. One day, the parents had to go on a business trip. They will be absent for two weeks. Now the older boy will have to look after his younger brother. In this case, the character must babysit his protégé, educate him, and support him in all his endeavors. The user takes the main character under his leadership. It depends on him in what direction the relationship will develop. Actions can cause both a negative reaction and vice versa. It is necessary to develop relationships between the guys. At the same time, it is worth going through this test in pairs. After all, it is easier to learn all the difficulties of adult life. Some problems will have to be solved intuitively, while the experience already gained will help to cope with others.

The action of I Love You, Brother is presented in the form of a drawn story. Particular emphasis is placed on the dialogues between the guys. In addition, other participants will meet on the path of life. Some will be friendly. Others will behave negatively towards the brothers. Each has individual character traits. The development of the plot depends on the chosen phrase. The user should make responsible decisions. Each problem can be solved in several ways. The main thing is to get rid of it or bypass it. The game has several alternative endings.