Korekara no Koi no Hanashi wo Shiyou

During summer break in elementary school, Ryusei sees his sleeping brother get kissed by Hide, his brother's best friend. At his brother's wedding, he is reunited with Hide. He notices that Hide still looks at his brother with the same eyes as before, but at the same time he starts to fall for Hide's kindness and gentleness...

(Source: Renta!)