True ending: You (the player) persuade Monika to rejoin the Literature Club, but the MC resigns from the Literature Club, so the other girls can be spared from more pain. The MC gives Monika a farewell poem. All four girls are heartbroken to see you leave, and they sing you this song as you depart.
T_T They actually made a version of all characters singing? I'm surprised they haven't made a version of Senpai Singing, Senpai may not be in Doki Doki Literature Club, but Monika's his Girlfriend, and he still counts