1-4. Kouryaku Syndrome
Hina is a typical game otaku ever since one can remember. The day he falls in love, he bumps into the worst scenery; his crush happens to be his mortal enemy's younger sister, Natsushiro Ryusei! What shall the big brother say..., or probably request from Hina?
5-6. Love Prologue
7. Kouryaku Syndrome: After Story