Azuki-chan - 1995 is rated/received certificates of:

Japan:G

An azuki bean is an annual vine widely grown throughout East Asia and the Himalayas, or the bean of the vine.

Azuki beans are very small, dry, red beans with a small white stripe.

Thomas A. Lumpkin has written:

'Azuki bean' -- subject(s): Azuki, Utilization

'Azolla as a green manure' -- subject(s): Azolla as fertilizer, Azolla, Rice, Fertilizers, Azolla as feed

No, Mashiro and Azuki do not kiss in the manga or anime series "Bakuman." Their relationship is developed more around their mutual goal of pursuing their dreams of becoming mangaka and voice actress, respectively.