Kyou kara Kazoku, Soshite Koibito.

Taka lost his parents in a sudden accident, and Hina's grandfather who lived with her, collapsed and was taken to a care facility. With no one to take care of them, they decide to live together. One night after cleaning up the house, Hina sees Taka crying alone and asks him if she can sleep on the same futon with him...

'Once, I remember reading with great intensity a porn book that somebody dropped on a path that students take to school.' Freelancer and perennial part-timer Atsushi Sarada, for the sake of today's generation of students, buys a porn book at a convenience store and on a whim, drops it in a bush at a park. The next day after finishing his shift, he suddenly remembers the porn book he threw away, so he heads to the park to check. Greeting him there was the sight of a high school girl, absorbed in reading the porn book and her face red with embarrassment. The girl notices Sarada's figure, starts to panic and confesses that she was only reading it out of curiosity since she doesn't have any sexual experience. Sarada then propositions her: why not have an actual experience over there in the park restroom? So they go, and Sarada is both astonished and really turned on by this girl's receptive attitude; and then he pulls down his own underwear and whips it out right in front of her eyes... (Source: [DMM](https://book.dmm.co.jp/product/801604/b866afgwi00424/)) --- [Note: This has 2 near-identical versions, one is a heavily censored softcore version and the hardcore version marked R-18 has black bars. The covers are slightly different, but the story is the same.] Originally published as Erohon wo Sutetara Kono Ko ga Tsurechatta!? (エロ本を捨てたらこの子が釣れちゃった！？)