Haitoku Onee-san no Yuuwaku ni Kimi wa Kateru ka?

Nagokatsu

"Come on, Taa-kun... How about we give you a real college debut?" Taiyo is ready to chase his dreams after becoming a freshman at a prestigious arts college, until he meets Miharu... a beautiful, yet hopelessly chaotic oneesan. Drawn to Taiyo's earnest, straight-laced personality, she embarks on a relentless campaign of flirty temptations. Can Taiyo resist her playful seductions, or will his willpower crumble? Brace yourself for a delightfully scandalous, everyday rom-com!