Toya Aoyagi is in love, and he doesn't know what to do.

Ever since his feelings started to develop, so started a writhing pain in his chest, which was followed by coughing out forget-me-nots.

How ironic that this flower that means true love had to escape his lungs in a circumstance where his love is not reciprocated.

His days at school have become harder, having to constantly escape to throw up the flowers. You caught on to this behaviour of his, and followed after him.