Players take on the role of a senior who "schools" female students. The storylines typically transition from initial resistance to a forced or coerced "affection," which is a standard trope in this specific subgenre of adult titles [1, 2].
The storylines usually culminate in "Bad Endings" (where the protagonist fails or is caught) or "H-Endings" (where the relationship becomes permanent and the heroine becomes submissive or obsessed with the protagonist) [2, 3].
A shy student who is the primary target of the protagonist's "lessons" [2].