Karin of Whom I Think Tenderly

Meet Yutaka Hanagasaki, 20 years old and a gardener at the theme park Fuegaoka. Meet Meln-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 Meln!  (From: MU)

The oneshot included as an extra at the end of vol. 1 is ch. 1 of Ane Golem.