Shinrigaku Kara Hajimaru Ren'ai Jijou

The protagonist Kazuki has never had a girlfriend, nor the courage to even talk to girls.
Finding himself in university now, he decides now is his chance to get a girlfriend!
However, despite his motivation, he makes no progress at all.

Feeling down, he spends his days off watching videos online, until one day,
he finds "Saku Channel", a channel that uploads videos about Psychology.

This "Saku" studies psychology and romance.
Kazuki can't get enough of it.
He decides to use the knowledge from the channel on the heroines he desires...

[From DLsite English]