Mayo Chiki!, Oniichan dakedo Ai sae Areba Kankeinai yo ne! Recommendations
Romantic-comedy-harem with very little plot.
Extremely similar character designs and art (notably, Anastasia and Usami, Gin and Subaru).
Both look very good and deliver nicely on fanservice and relatively lowbrow comedy.
series give off the same vibe when you watch them, they are all ridiculous and fun to watch