If you're looking for anime similar to Renai Shikou Seitokai, you might like these titles.
The secret romantic relationship between Hayato Izumi and Ui Wakana has become more "exciting" with Honoka Saijou, chair of the photography club, starting stalking Wakana for possible scoops.
High school freshman Hayato Izumi lost the campaign for student council president to Ui Wakana, a girl who shocked the entire student body by promising "will remove all restrictions on campus romance" and gave away free condoms. Later that day Wakana the president-elect brought her belongings to Izumi's residence and claimed herself his betrothed fiancée.
Earth faces an unprecedented threat from an invasion by the mysterious Kiseichuu. The Kiseichuu feed on human sexual energy, also known as “H-energy”, and weaken the human population. High school student Retto Enjou is a member of the hero group HXEROS, who fight together to save the earth from the Kiseichuu.
Kirishima Haruto travels to Tokyo on a school excursion, where he hopes to catch up with Yuzuki Eba, a girl who formerly lived in his house and whom he has feelings for. Things don't go according to plan when fellow student Nanami Kanzaki, who secretly loves Kirishima, asks him to pretend to be her boyfriend.
In Japan, the lonely have a new way out — online services that rent out dads, children, even girlfriends! When Kazuya's true love dumps him, he's just desperate enough to try it, and he's shocked at how cute and sweet his rental girlfriend turns out to be. But she wants to keep their "relationship" a secret, and there's a complication... she goes to his university... and their grandmothers are in the same home... and they live next door to each other?! And Kazuya finds out she's not nearly as nice in "real life"...