Mitsunaga Ougo is Trying to Control Himself

Karen is head over heels in love with her childhood friend, the brusque and fierce-looking Mii-kun. Day after day, she makes amorous advances toward him in hopes of making him her future husband. But when it's just the two of them, she can't help but feel a little nervous...? She's a headstrong queen in front of everyone else, but when faced with the boy she likes, she can't help but turn back into a blushing schoolgirl?! A youthful love comedy that will make your heart pound! (Source: NINO, translated) *Note: Chapter count includes 3 extras.*

Karen and Mitsunaga are now 20 years old. Mitsunaga used to say that marriage is too early at 20, but he is beginning to think that maybe it wouldn't be so bad. One day, while they were out on a lovely day like usual, Karen has an accident! (Source: NINO, translated)