Serialized as 一途な瞳は誰のもの!? (Ichizu na Hitomi wa Dare no Mono!?), but published in tankobon as 主従な同級生 ([Shujuu na Doukyuusei](https://www.mangaupdates.com/series.html?id=114432)).

Geofront. An underground world in which reside all those excluded from society. Komugida wants to leave the basements of Geofront at all costs by enrolling in a university on the surface, but eventually returns to live underground to work as the private teacher of a young boy with divination gifts, named Theo. His father, Nagasa, is according to him a "mafia killer"! A life altogether ordinary for the inhabitants of these undergrounds, who try as best they can to survive in a hostile environment excluded from the surface of the Earth. *Note: Volume includes an additional, unrelated one-shot.*

Adapted from the novel. Souryuu Riku (Suzuki Tatsuhisa), the oldest son of a poor family with many children, decides to use his often beaten-up appearance to get his next target, a rich-looking lawyer, Kouzuki Kaname (Ookawa Tooru), to cough up some cash to help raise his younger siblings. The plan as usual was to use his body just as bait, but somehow things didn't go as smoothly as he'd expected. Though Kouzuki maintains the appearance of the perfect gentleman on the outside, on the inside, he is sly and cunning and will do whatever it takes to make Riku his own! Riku's heart and body have already become accustomed to drowning in the pleasure he gets from this wolf in sheep's clothing...but will he ever admit to the truth?