High school student Hayato Katsuragi is reincarnated as Rayvelt Runwalker, the son of an aristocrat from another world, after a traffic accident. At the time of his reincarnation, the goddess bestows upon him a cheat skill with no level limit, but at the same time, he also acquires the most dangerous skill, "One Who Has Been Struck by Difficulties." Condemned to a life on hard mode, Ray decides to undergo intensive training to become stronger. While undergoing training, he lives a happy life surrounded by his cute maid and younger sister, but then a horde of monsters invades...!? (Source: CMOA, translated)

The main character is obsessed with big breasts. His schoolmate confesses to him, but he keeps caressing a tree that has 2 big boobs, and a miracle happens...

Katahaba no Mirai Oneshot from "Mirai no Yukue" collection. "it's a short one-shot portraying one moment in a couple's life." -- from here

The story takes place between episode 22 and episode 23 of Blue Dragon: Tenkai no Shichi Ryuu. Shu, Bouquet, Marumaro and Noi travel to the floating city of Flugel, to gather more clues regarding the Investiture Beings. There they meet the city's guardian Jiranda and the priest Eba where they find it inhabited by robots only. (Source: Blue Dragon Wiki, edited)

Human beings have turned their planet into a desert covered with garbage. The only place to live is the Megapolis, a giant city where men and robots are crowded, as well as the mysterious Ersatz, monstrous creatures hunted down by the Militia. In this world in perdition survives Misha, a young orphan girl with overdeveloped gifts of empathy. Unable to control her ability to read the emotions of others, she stays away from her peers. Yet it is thanks to this power that she finds Reborn, a morphing robot wandering without memory in the middle of a landfill. This technological marvel is capable of adopting any appearance. Without hesitation, the girl made him take the form of Mickael, her best friend, of whom she has had no news since he was kidnapped by a group of Ersatz ten years ago. Where do these creatures come from? What happens to those they capture? No one knows... To find his companion, Misha joins the Reinforcements, a group of outstanding warriors and investigators! In exchange for their help, she puts at their service her psychic abilities and her ability to make Reborn an overpowering armor. The fight for the truth begins!

While the entire class is transported to another world, only Akari dies and is reborn as a beautiful girl in that other world. Even when facing trouble along the way, she lives her second life positively, brightly, and sometimes boldly. She takes down shitty nobles, corners criminal organizations, and lives ultra positive days... You can tell she was a well liked personality among her classmates!!! *Source: Comic-Walker*

Real beautiful girls are mostly bitches. With that motto in mind, Ikuno Kousuke used his literature clubroom to enjoy his otaku life. One day, he was told that [However, as it is, the literature club will be disbanded] by the student council president’s assistant, the bishoujo, Shinonome Ibuki. In order to avoid that, he must help the student council as a consultant together with Ibuki. Their first job is to help the girl who —with Shinonome Ibuki— splits the fame in school into two, the blonde, big-breasted bishoujo Aizawa Mahana. Although there are rumors about her dating many boys, she actually doesn’t have any experience about love so she wants Kousuke to be her fake lover….!? The love comedy BITCH x OTAKU begins.

'If our hearts go down, our country goes down'. Julius Rohr, a young man who rose to the rank of general in the great empire of Gran Verdea. He decides to rebel in the face of a young girl who lost her life in a military operation he led. He raises an army to correct the Empire's unreasonableness. Contrary to Julius' expectations, the uprising spreads like a wildfire, starting with the death of one person and ending with the deaths of a million! Julius is determined to end the uprising with his own life, but his followers will have none of it, and ship him away from the continent. Julius is swept away and wakes up on a strange island. In an unknown land where the level of civilisation is some 300 years behind the Empire, Julius tries to make a second life for himself, but something is not right here. Unusual creatures, outbursts of firearms, and the unintelligible concept of 'mahout'. Julius, a man who has crossed the border between two worlds with different principles, begins his "new life as a general"!

Four young people are looking forward to spending their youth in their new dormitory life, but find out to their disappointment that their dormitory is an old and run down place in this fresh comedy about living together. (Source: M&C!)