Catulus Syndrome - A strange illness which causes girls to develop catlike traits. Modern science has figured out two things about this illness: 1. They're really cute! 2. There's a high chance of other girls making their hearts flutter.
Catulus Syndrome is a completed manga by Nekotarou, first published in 2016. It blends comedy, girls' love and slice of life. You can read all 108 available chapters of Catulus Syndrome online for free on MangaPulse; the newest is Chapter 100, added 2021-02-15. The series is finished, so you can read it from start to end in one go.