Ch. 6: Kuro just wants to be united body and soul with someone he loves, but always gets broken up with due to his huge penis. Despite how desperate he is, Kuro won't even consider his promiscuous, bottom neighbor Shiro, who brings home a different partner every night. One day, after drinking, Kuro wakes up to find he and Shiro have switched bodies.
Dependable middle schooler Makoto has always taken care of his older brother Satoshi, an airhead with no common sense. One day, Makoto arrives home to find Satoshi has brought home a disheveled and suspicious man, straight from a garbage pile. Though Makoto wants to hurry and call the police, the look on his love-struck brother's face won't let him, so now, the man, named Ayu by Satoshi, is freeloading at their house.
High school teacher Haruchika lives with his lover and former student, host Kiyomasa. Though Haruchika said he would make Kiyomasa happy, Haruchika is the one benefiting from Kiyomasa's home cooked meals and skills in bed. One night, Kiyomasa helped out Asako, Haruchika's problem studen. Now, Asako is attached to Kiyomasa and is disturbing their lovey-dovey life.
Cafe part-timer Kotaro is in love with a regular customer, elite salaryman Aoyagi. Knowing Aoyagi is out of his reach, Kotaro is satisfied with collecting Aoyagi's discarded trash and using them to masturbate. When Kotaro starts living by himself, he's excited to discover Aoyagi is his next door neighbor. However, Aoyagi ends up finding out about Kotaro's collection and his feelings. Luckily, Aoyagi is able to accept Kotao and, secretly, even has some strange tendencies of his own.
One day, 25 year old theater actor Kanade wakes up to find he's turned into a child and Kanade's love Yuuki, a 30 year old bus driver, immediately panics. Their situation becomes more complicated, when Yuuki's younger brother Yuuta comes to live with them.
2 months ago, ordinary salaryman Yuuichirou picked up a man, himo Aya, sitting outside of his house in the rain. Though Aya's stay was only supposed to be temporary, Yuuichirou begins to find living with him comfortable and cannot bring himself to ask Aya to leave. Things become complicated when Yuuichirou realizes his feelings for Aya.
Ch. 1: Ryou has always looked after his younger neighbor Tsubasa like an older brother. When his feelings for Tsubasa changed, Ryou held back. However, now, Tsubasa is saying he'll take full responsibility and make Ryou happy
Ch. 2-3: Ishikawa has denied his sexuality since middle school. While working as an intern, Ishikawa is constantly sexually harassed by Shouzen. One day, Ishikawa's secret part-time job is discovered by Shouzen and Shouzen blackmails Ishikawa into living with him
Ch.5: A month after moving to a new apartment, Kinoshita discovers his neighbor his former baseball senpai Fujisawa, who he hasn't seen since graduation 7 years ago. Now, Kinoshita is assisting Fujisawa like he used to, no matter how selfish he gets
Ch.7: Kenichi is living with his former delinquent student and lover Ryou. However, recently, Ryou seems to be avoiding him.
Ch.4: Yamato's family owns an S&M club that finds and punishes their client's targets. Yamato is requested by his neighbor actor Abe to deal with his stalker Mitsu. However, after Yamato takes Mitsu in to keep an eye on him, Yamato end up falling for him
Ch.9: Whenever, Minato tries to do something to make his lover Nacchin happy, his clumsy and stupid nature messes it up
Kuro Ouji no Iinari ni Naranai!