I Saved Too Many Girls and Caused the Apocalypse

 (俺がヒロインを助けすぎて世界がリトル黙示録〈アポカリプス〉!?) (Ore ga Heroine o Tasukesugite Sekai ga Little Mokushiroku!?) is a ongoing light novel series written by Namekojirushi and illustrated by Nao Watanuki. First published on June 1, 2011, the series has currently released sixteen volumes.

HobbyJapan
On his sixteenth birthday, Namidare Rekka’s innate constitution to be “dragged into the troubles of various girls” blossoms. To make things worse, someone from the future has come to warn him of a huge upcoming battle caused by the girls he will be saving. However, Rekka is unable to overlook the SOS from the girls, and in the end, gets into a mess to save them all.

Let the big adventure of ingenuity and battles to save the heroines begin!

J-Novel Club
Rekka Namidare was a normal boy until his sixteenth birthday. Then a girl suddenly appears from his future, warning him that he'll somehow start an interstellar war! It turns out Rekka hails from a special bloodline that's destined to get caught up in all kinds of trouble. Whenever a story's heroine is in dire need, Rekka will be given one last chance to save her. And in the future, Rekka will have saved so many girls that their jealous love for him will cause the apocalypse!

Manga
A manga adaptation of the series, illustrated by Haswegawa Kouji, was serialized from December 2, 2011 to January 31, 2014 in Hobby Japan's Comic Dangan. The adaptation is collected into five volumes, covering the first and second volumes of the light novel series.

License
On October 28, 2016, J-Novel Club announced that the digital publishing company had licensed I Saved Too Many Girls and Caused the Apocalypse for weekly installments, with the first part free of charge, before eventually releasing the volumes as e-books.

Trivia

 * As of Volume 15, Rekka has been involved with 33 different heroine's stories.