The story is about a man whose compulsive tendencies make it impossible for him to keep a job, and a young girl who skips school and loves insects. The two meet, come to support each other in reintegrating into society, and fall in love. There’s a problem, however: namely, the parasites in their heads.
Parasite in Love is a completed manga by Miaki Sugaru, first published in 2018. It blends psychological, romance, drama and slice of life. You can read all 22 available chapters of Parasite in Love online for free on MangaPulse; the newest is Chapter 14, added 2021-08-24. The series is finished, so you can read it from start to end in one go.