If you're looking for manga similar to Mako to Rumi to Chii, you might like these titles.
Yamato, a boy who lives in Shirakami Mountain Village, loves festivals. He visits the Tokyo Girls Collection, attracted by its title as “The BIGGEST fashion festival in Japan." Although he doesn’t have a ticket, he manages to get inside. He encounters a fight between models, and successfully breaks it up. At that time, one person shows up and offers him an opportunity to work as a producer. Will Yamato be able to take advantage of this BIG chance?!
Kazusa is an ordinary high school girl that's madly in love. She often visits the house of the super rich, popular, and sexy Itsuki-senpai. However, Kazusa isn't there to see Itsuki, but his old butler Yagi Shinemon?! Can Kazusa defeat the age difference and obtain true love? And what about Yagi? Although polite on the surface, Yagi is not thrilled at this threatening, bratty girl hovering around his young master, who he so carefully raised himself.
Yurika Nanba doesn’t need hobbies… not when she spends all of her free time thinking about her ex-boyfriend! Notwithstanding that they’ve been broken up for 5 years (and she hasn’t heard from him at all), Yurika proudly describes herself as a “Motokare Mania” — an Ex-Boyfriend Enthusiast. But just when a new love seems on the horizon, the company she works at makes a new hire… her ex!