Growth Process (成長過程, Seichō Katei) is an extra chapter included with Volume 16.
Summary
Eyelashes and Glasses stop some criminals at a convenience store. They chat and discuss each other's situation where Eyelashes praises Glasses on his improvement although Glasses denies that and states that he has much more to improve on. An explosion erupts in the distance and Glasses heads towards it. Eyelashes stops him as he doesn't believe he can stop the monster on his own. Glasses states his conviction to grow and leaves Eyelashes to call Fubuki. Eyelashes watches Glasses leave as he informs Fubuki of a hero on the scene of the disaster. He is left feeling jealous of Glasses.