, shortened to , is a Japanese light novel series written by Pan Tachibana and illustrated by Yoshiaki Katsurai. The story centers on Ryosuke Kaga, a lecherous high school student who makes a contract with Lisara Restall, a beautiful Grim Reaper, in exchange for his lecherous spirit.
Dakara Boku wa, H ga Dekinai began serialization in Fujimi Shobo's Dragon Magazine in 2010. The series' eleven volumes were released between June 19, 2010, and August 20, 2013. A manga adaptation illustrated by Shou Okagiri began serialization in the May 2011 issue of Monthly Dragon Age, and released five volumes as of December 9, 2013. A 12-episode anime adaptation produced by Feel was announced, and aired from July to September 2012 on AT-X and other networks. The anime series was licensed by Sentai Filmworks in 2013 for distribution in North America. Sentai Filmworks has released the series on DVD, Blu-ray Disc and for online streaming.
Plot
One day, Ryosuke Kaga, a high school boy attending , meets a girl standing alone in the rain. Introducing herself as Lisara Restall, an elite Grim Reaper, she visited the human world in order to find "The Singular Man". Ryosuke makes a contract with Lisara, while sucking energy required for her activity in the human world from Ryosuke. The source of the energy is his lecherous spirit. To preserve his life, Ryosuke has no choice but to help in Lisara's search.
Characters
Main characters
Ryosuke is a second-year student at Momozomo Academy, who uses his lecherous life-energy to give Lisara energy. Also, he learns from Lisara that he will die in three months and in return for his help now, she will try to change his fate. Lisara uses the Broken Sword, Gram, which used to belong to the god of war, to form a contract with Ryosuke. However, it was revealed later that Ryosuke has the other half of Gram (which was thought to be lost), thus gaining full power of the sword. He falls in love with Lisara, and can only fully charge his lecherous spirit energy if he thinks of her body alone or with his "Invisible Dictionary". He lives on his own (until Lisara moved in) because his mother works overseas; his father died when he was 3 (his mother later reveals that his father isn't actually dead but that he disappeared). At the end of the anime, he and Lisara became a couple even though Lisara still feels uneasy about his lecherousness.
The heroine of the story, a beautiful Grim Reaper who makes a deal with Ryosuke and uses his lecherous "spirit" for energy. She wields a scythe called , which channels the element of fire. She used the hilt of the Broken Sword Gram (belonging to the Restall family) to form a contract with Ryosuke. She falls in love with Ryosuke but does not show it, unlike the other girls. Her bust size is seventy-something cm. At the end of the anime, she and Ryosuke became a couple.
Ryosuke's childhood best friend and currently Quele's partner. She developed a large bust early in her childhood and is now a 92 cm - G-cup. She has very strong feelings for Ryosuke as he protected her when they were children. She is aware of Ryosuke's lecherousness and it doesn't seem to bother her. Mina is untroubled when Lisara's true identity is revealed and lets Lisara continue her "business" with Ryosuke. She makes a contract with Quele so that she can help Ryosuke and her energy charge for Quele develops when she talks about him.
Lisara's distant cousin and another Grim Reaper. She calls Lisara "Onee-sama" despite not being her sister. She makes a contract with Mina as her energy source, to both Ryosuke's and Lisara's dismay. In battle she wields a gladius called , which channels the element of ice. She falls in love with Ryosuke but later in the series, she pushes those feelings aside to support first Mina, then Lisara.
Lisara's rival Grim Reaper during her school years at Grimwald, who is also a famous pop idol in the human world. Despite being 2nd in the school (Lisara being ranked top of her class), she has the biggest bust size of the main cast (92.5 cm - G-cup). However, her large breasts are revealed to be a result of infusing breast pads with magic, and her actual bust size is smaller than Lisara's. She wields a falchion named , which channels the element of lightning. She also claims to be in love with Ryosuke, but so far it only seems she likes him because of the energy he can create. She is also trying to find a Singular Person for herself (to level in rank) and for her employers. Instead of gaining energy from a contract with a person, she gains energy from the devotion of her fans.
Momozomo Academy students and staff
Ryosuke's classmate.
The son of the headmaster. A narcissist.