Watashi, 2-banme no Kanojo de Ii kara

Hayasaka-san and I are dating each other as the backup option, even though we both have someone we love more.
I'm sure we're still lovers. We walk home together, sneak out to see each other, and do unmentionable things together.
But second choice is still only second best, and if either of us were to have a shot with the person we love the...