Maji de Watashi ni Koi Shinasai!, Mashiro-iro Symphony: The Color of Lovers Recommendations
both guys getting liked by many girls
both guys only like one girl more than the other
however maji de has action mix in with ecchi, while mashiro have more romantic feeling to it.
1 guy surrounded by tons of girls. Maji de Watashi ni Koi Shinasai! does contain much more action than Mashiroiro Sympathy but the theme of harem is still there. Both series also have romance and some ecchi.