Episode: Steins;Gate - 7 - Divergence Singularity 2u1h5e

After Daru updates the Phone Microwave's firmware, Rintaro decides to perform an experiment attempting to change history by sending winning lottery numbers to the past. Upon sending the D-Mail, he experiences a sensation similar to the one he had before the satellite crash. Discovering no one else was aware that the experiment even took place, Rintaro finds his D-Mail had indeed led to Ruka purchasing a lottery ticket, although his own personal error led him to get the number wrong. After a brief encounter with Suzuha, Rintaro deduces that the D-Mail had shifted him to a World Line Ruka had bought a lottery ticket and the D-Mail experiment never took place, explaining everyone's altered memories. Confused as to why only he can the previous World Line, Rintaro s Titor, who tells him he may have the power to become a messiah and lead the world beyond the "1% Divergence" point and hence, change the dystopian future.

Source: Wikipedia