If you choose Haruka-san for Kengo :
The "Romantic President".
Spoiler:
Kyousuke asks Rin to find Haruka but she can't find it so she take Komari-chan. Kengo known as the "Romantic President" will try to talk with her... about love. But she asks him if he fall in love into someone, he replies with a yes. The funny thing is that Komari-chan don't know that Kengo "fall in love" into her. She asks who's the lucky girl and Kengo pointed at her, she replies with : "Fue? Yep, i'm your cupid.".
He asks then to Komari-chan to shoot her arrow right up into the air so, it will find its goal (Riki says that it will come back right to her, TRUE but...).
Then, Haruka poked her head out of the window and the arrow touched her. So, Komari-chan will ask to Haruka but Kengo interrupt her by "Pretending that... This never happened".
So you got a big summary of that
