Koisuru One Piece

The premise of this gag manga spinoff is about three high school students: a young male student, his girlfriend and a third wheel who is a One Piece fanatic. Their names are similar to the Straw Hat Pirates and the group form a fan club dedicated to One Piece. Each chapter is a parody of the series.

(Source: One Piece Wiki)

Included one-shot:
Volume 2: Heyasagashi