\documentclass{minimal}
\usepackage{tikz}
\usepackage{verbatim}
%Farben
\definecolor{alertcolor}{RGB}{196,0,100}
\definecolor{Crimson}{rgb}{0.6471, 0.1098, 0.1882}
\definecolor{Orange}{HTML}{EB811B}
\usetikzlibrary{arrows,positioning,shapes,calc}
\tikzset{
%Define standard arrow tip
>=stealth',
%Define style for boxes
punkt/.style={
rectangle,
rounded corners,
draw=black, very thick,
text width=6.5em,
minimum height=2em,
text centered},
punktcolor/.style={
rectangle,
rounded corners,
draw=black, very thick,
text width=6.5em,
minimum height=2em,
text centered},
% Define arrow style
pil/.style={
->,
thick,
shorten <=1pt,
shorten >=1pt,
}
}
\begin{document}
\begin{tikzpicture}[node distance=1cm,relative, in=90, out=90]
%nodes and edges
\node[punkt, draw=Orange] (eins) {\textcolor{Orange}{Eins}};
\node[punkt, draw=Orange, inner sep=5pt,right=1cm of eins]
(zwei) {\textcolor{Orange}{Zwei}}
edge[pil, <-, bend right=0, draw=Orange] (eins.east);
\node[punkt, inner sep=5pt,right=1cm of zwei]
(drei) {Drei}
edge[pil, <-, bend right=0] (zwei.east);
\path (eins.south) edge [pil, bend right=50, distance=1cm] node [] {} (drei.south);
\end{tikzpicture}
\end{document}