KimiKiss Pure Rouge, Nisekoi Recommendations
The Characters are very similar to one another. Kouichi has a similar appearance as Raku. They both have a crush on a shy and reserved girl; Onodera in Nisekoi and Yuumi in Kimikiss. Both female leads are smart and lively. They both realize their love for the male lead. Both of the shows have a love-triangle. Both are also set in school.
The only difference is that Nisekoi has elements of mystery in it and kimikiss has two main leads.