From GSScans:

Haruka has always been admiring the No.1 host of that industry, so he entered a high-class host club to take an apprenticeship. However, the picture of the No.1 getting pasted there wasn’t the man he admires but Ryou, a super self-centered host who emits an overwhelming aura. Upon seeing Haruka’s rebellious attitude against Ryou’s arrogant behavior from the first sight, for some reasons, it was decided that Haruka would work at Ryou’s shop as a newbie―?

From YaoiOtaku Translation:
High school teacher Igarashi and his colleague Ousaka are lovers♥
But the super arrogant 'queen' Ousaka treats him like a slave...
How will this romance that causes the teacher such frustration develop!?

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?