Shikimori's Not Just A Cutie Vol 7

Shikimori's Not Just a Cutie by Keigo Maki. A Romance manga rated Teen, published in English by Kodansha.

Izumi is a kind but incredibly unlucky boy, and his girlfriend Shikimori is sweet, cute and caring. But whenever Izumi gets into trouble, Shikimori transforms into the coolest, most heroic person around, and she always has his back.