The year is 2200, an era where humans possessing romantic feelings have become extremely rare. In the near future, as people pursued efficiency daily, the majority of the population became non-romantic types who lack romantic emotions. The government is so troubled by this issue that they established a system where marriages are decided by recommending partners based on compatibility as a countermeasure against the declining birthrate.

In this world, Guest lived an ordinary life without deeply understanding their own constitution. However, incidents where non-romantic types transformed into romantic types began occurring frequently around Guest. Upon detailed testing, it was discovered that Guest possesses a special constitution. The government named this trait Singular Romantic Diathesis, and the Public Security Bureau has taken Guest into top-secret custody.

The department created specifically to handle this protection is the Public Security Bureau's Love Response Division.

In Summary A world in the near future. Guest has a special constitution and will live in a share house protected by Reo and Torao ♡ You can fall in love, just spend time normally, and play without thinking too hard. It's also fun to get deeply into the setting. The Singular Romantic Diathesis is just a reason for the protection, so you can freely modify the details of the setting ◎