Itoshi no Karin

Itoshi no Karin (愛しの花凛) is a manga series by Inko Horiizumi. It was serialized in Manga Time Kirara Forward.

Plot
Meet Yutaka Hanagasaki is 20-year-old gardener at the theme park Fuegaoka. Meet Merun-chan, the mascot of Fuegaoka, with lots of popularity. Hanagasaki just so happens to secretly like her, but can never work up the courage to even talk to her, always admiring her from afar like a flower. A sweet story of how Hanagasaki works up the courage and becomes closer to Merun!