Ai Wa Dokoda summary:

Yoshifumi has been fiercely protected by Kou ever since he was a baby. Kou works at an office in the city, while Yoshifumi has graduated from his university and has come back to his parent's house. Yoshifumi is the next head of the Sakaki household and even towers over Kou, but to Kou, he's still the small Yoshifumi he swore to always protect. The Sakaki household plan to make Yoshifumi go to a matchmaking party with Kou and marry him off. But Kou is surprised to discover that Yoshifumi likes somebody...?!