오늘부터 동거 1일차 is a mobile dating simulation game developed by Atticfriends Inc. In this game, players take on the role of Yu Jin, a normal college student with no dating experience, who suddenly finds himself with a girlfriend. The game revolves around the sweet cohabitation life that starts abruptly with her request.

Aside from following the story, players can also experience various elements such as dating, part-time jobs, and going out. As you progress through the game, you can gradually build up your girlfriend Serin's affection.

However, amidst the enjoyable experience of building a relationship, there is a constant sense of unease. The protagonist's own worries and the challenges that come with being in a relationship bring a sense of suspense. Will you be able to navigate this relationship with happiness and excitement?

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