That last one is the subject of a Game Design Deep Dive, an awesome feature over at Gamasutra that has developers explaining some of the finer points behind the games that they've made.
Bad Boys Love, a hidden alternate story mode, opens with the discovery of the protagonist's corpse, after which the player follows her best friend Ryouta Kawara as he investigates the circumstances of her death and unravels darker conspiracies surrounding the school.
Gameplay in Hatoful Boyfriend is similar to most other visual novels for the PC, with the controls limited to the mouse and the only interactions being clicking to forward the game's narrative or to choose between multiple plot choices.
After a few dating lessons and some sound advice, Kyu sends you out into the world ready to take on the dating world and a wide cast of beautiful babes.
is a Japanese dōjin soft otome visual novel released in 2011 for Microsoft Windows and OS X.
These frameworks are not part of Ren'Py proper, and are supported by their creators.