"An event that should never happen between friends has occurred." Friends Ji-eun and Yuri confirm their feelings for each other with a kiss and begin their romantic relationship. However, even though they have dating experience, this is their first time experiencing love, so they are clumsy in many ways... With situations that must always be hidden, the anxiety of approaching graduation, and personal matters that they cannot share with their partner, their relationship often feels shrouded in darkness. (※ It is recommended to read 'Night and Night Main Story' first, then 'Between Friends', and finally 'Night and Night Side Story' for a better experience.)