Similar to サナダくんは私のお尻に住んでいます

Gunjō (manga)

You Were Experienced, I Was Not: Our Dating Story

Melancholic Princess

Parasitic worm

Gyrodactylus salaris

Ommatokoita

Eimeria

Eimeria acervulina

Eimeriorina

Eimeriidae

Eimeria necatrix

Acarapis woodi

Aggregata

Ascetosporea

Adeleorina

Apicomplexa

Isospora

Linguatula serrata