SILKU-056 Yes or No?

A group of close friends from university were having an octopus-burning party, but the last train home, leaving Junya and Noriko alone in a closed room... However, situations like this are common, and the two get along well and forget that they are of the opposite sex, so they just drink all night like it's normal... or at least that's what they were supposed to do, but as they start teasing each other, things start to get a little strange...?!