Ruri Asano

Meet Galan, a spastic geek who'd do anything to be a real, live samurai. But that's just an impossible dream. When his Russian princess girlfriend gives him the gift of an ancient sword, strange events unfold, and even stranger people drop out of the sky to attack. Now Galan must overcome his ineptitude and join a bunch of beautiful women in a wacky romp through a kingdom that time forgot. (animenewsnetwork.com)

One guy. Five girls. One roof. It's a recycled idea, but it never gets old. Happy Lesson is a kinetic take on an old genre. Chitose shares his house with five ladies. One might think the continued attention of this many girls would be a good thing, but too much attention can prove to be painful. Did I mention they're also instructors at his school (hence the title)? Not only is he the subject of their abuse at home, but at school as well. (myanimelist.net)

Hitotose Chitose was always alone and untrusting of people but when 5 female teachers appear and started living together with him in his family's house as his mothers, things started to change and pick up, together with Hazuki-nee and Minazuki (his 2 sisters) everyday is a lesson. (myanimelist.net)

Hitotose Chitose is now living together with his 5 teachers as his mothers when a mysterious girl appears and becomes their neighbor which turns out that that person is Nagatsuki Kuron who wants Mu-chan to be her mother so another sibling rivalry ensues as to who would end up as Mu-chan's child. (myanimelist.net)

Akira Motoura and his team or rather his harem travel to a hot spring resort to train for the upcoming volleyball game. This time they got two new rookies to strengthen their effort. Little do they know that they are being lured into a trap set by the two beautiful newcomers.