When was Kosaka-san. released?

Kosaka-san. was released on November 3, 2018.

What platforms is Kosaka-san. available on?

Kosaka-san. is available on Web browser, PC (Microsoft Windows), Mac.

Who developed Kosaka-san.?

Kosaka-san. was developed by GENKAI OTAKU SPACE.

Kosaka-san.

About

After an unpleasant incident, the unnamed high-school student protagonist finds himself unable to make friends with most of his classmates. To escape the bustle of lunch time, he goes to the school rooftop. However, one day he finds there a girl who tells him a meteorite is about to hit Earth and wipe humanity, and that she wants to commit suicide before that happens.