When Satoru, a Japanese high schooler, decides to spend his summer in Germany with his older sister Miho, he expects an exciting change of pace. What he doesn’t expect is to end up sharing the apartment with an extra guest. Silke, the younger sister of Miho’s friend, is a beautiful girl just a year older than Satoru. All the teenager wants is to get closer to her —there’s just one problem: she only speaks German, and he barely understands a word.

As the summer days pass, they form an unexpected bond, navigating their cultural differences, misunderstandings, and growing feelings. But can love truly blossom when words fail?