天地于暑假至爷爷的征木神社打工的天地，在好奇心的驱使之下，不小心放出了已封印七百年的妖怪—魉呼。而天地开学后回到学校，魉呼却也追到了学校，于是两人便在校舍内展开了追逐战，其结果便是校舍全毁。而匆忙逃回家中的天地，却发现魉呼已在家中等待.

为了找寻大哥遥照而四处旅行的树雷星公主阿重霞，意外地在地球上发现了遥照当初追缉的犯人魉呼，因此魉呼亦召唤魉皇鬼带着天地逃命，但依然为阿重霞的龙皇所制服。在龙皇中砂沙美因无聊没事做便放出被困的天地，于是接着变造成一场混乱，但阿重霞亦重天地口中得知遥照已死。就在此时魉皇鬼冲进龙皇，继而带着龙皇冲向地面……，于是自此之后魉呼、阿重霞与砂沙美便在天地家中展开新生活。

魉皇鬼因毁损过于严重，便自行再生出一粒蛋，随之便孵出小巧可爱的魉皇鬼。而阿重霞却被魉呼戏弄魉皇鬼为天地与魉呼所生之小孩而跑出门。在森林散步的阿重霞意外地发现天地与爷爷正在练剑，而其剑法正是树雷星之剑法，于是正想上前询问时却失足滑下山坡而受伤，因此天地便背着阿重霞回家，途中阿重霞发现遥照宇宙飞船之船穗而得知遥照尚在人间，因此阿重霞与天地之关系便更进一步。

天地一行人至伯母所开之温泉旅社洗温泉，而魉呼与阿重霞却因争风吃醋大打出手，于是魉呼便召唤出鬼怪，但却无法控制而造成能量失控。就在此时因追缉宇宙通缉犯神我人而驾驶宇宙飞船来到地球的美星，却意外地卷入能量失控中，继而使宇宙飞船与鬼怪被吸入亚空间中，也因此天地家中又多了一名食客了。但就在此时神我人已渐渐接近

正当魉呼、阿重霞与美星在空中澡堂洗澡并谈论天地时，神我人突然出现并强行把魉呼带走。于是天地一行人便追至船穗与神我人展开战斗，但天地不敌，就在此时，天地的爷爷，亦为遥照出现与神我人战斗，于是神我人便带着被其控制的魉呼回双蛇，而在此时阿重霞发现了天地爷爷的真实身份。天地等人为了救回魉呼，便乘着与龙皇合体的魉皇鬼前往双蛇，但途中在神我人的无情攻击下，合体部份之龙皇全毁，而在其中之天地亦随之消失。

魉呼因见到龙皇全毁而在激动之下力量大增而挣脱神我人的束缚，但却发现天地消失……。于是为了替天地复仇，魉呼等人便攻入了双蛇，但美星却误入双蛇的里世界而误打误撞地救出宇宙第一科学家—鹫羽。而魉呼因阿重霞之故而不敢使出全部之力量，于是鹫羽便将阿重霞传入里世界，但魉呼依然敌不过神我人。就在最后关头，天地出现了。原来天地是被与砂沙美同化的津名魅所救且被引出原本隐藏之真实力量。于是最后天地便靠着本身之力所造出的光鹰翼剑打败了神我人。从此之后这一群人以及魉皇鬼便在地球上展开了平稳安定的生活。

在神我人事件过后，天地等人便过着平稳安定（？）的生活。但是，虽然没有发生像神我人事件这般如此大的事件，但是……。阿重霞与魉呼为了天地而争风吃醋所发生的种种事件；鹫羽为了实验而不惜以『全套服务』来取得天地的SEED；阿重霞与魉呼为了独占天地而连手使计让美星回银河警部所发生的事件；最后美星回地球降落时所发生的乌龙事件，而其造成的结果……。而这些便是天地一家人所过的『平稳安定』生活？

美星自己讲述的关于她作为银河警察的生活的旁白。在她的故事中，美穗介绍了她的搭档清音，并解释了他们是如何解决丢失的超级能量物质的问题的。

从婶婶家回来的砂沙美似乎有所心事而有意回避大家。婶婶因其女儿身体不适，便将孙子托给天地照顾几天。而在照顾的过程中，发生了许多爆笑的趣事。照顾到最后，魉呼、阿重霞与美星不支倒地，于是便靠鹫羽来照顾，而鹫羽也因照顾小婴儿而回想起过去曾结婚生子之事。最后随着小婴儿被接回，天地一家的生活亦恢复原来的样子。

天地全家人至伯母的温泉旅社玩，而砂沙美却依然有意避着大家。就在大伙在旅社活动时，却发现似乎有幽灵出现，最后竟发现幽灵来源为砂沙美，于是砂沙美便跑进树林中。之后阿重霞于湖边找到砂沙美，原来其幽灵为与砂沙美同化的津名魅，而砂沙美即是为了此事在烦恼，于是经过阿重霞与天地的开导后，砂沙美便恢复以往开朗的样子。最后随着津名魅出现解释，这次事件便圆满地落幕了。

魉皇鬼想帮助天地做事的心意，驱动了鹫羽实验室中的万素，而使其合体为一人形。来到田中想帮助天地的万素人形，因缺乏主脑控制而变成具有极高之危险性。于是见到天地有危险的魉皇鬼便跳至万素人形身上并与之同化，成为控制它的主脑。自此之后，魉皇鬼便可变成人形了。而在此时，一艘不知名的宇宙飞船出现在宇宙之中……

被访希深授权带回鹫羽而来到地球的克雷，绑架了魉呼并用其机械人—零复制了其外貌及思想而混入天地家中。而这时美星接到命令回到宇宙追查被劫之战舰。零因复制得太过于完全，所以一见到天地便……，而鹫羽不久后亦发现其为假冒之魉呼。零因天地之故而无法达成任务，于是克雷便令零除去天地，而零便在天地睡着时一剑刺向天地……

零因复制得太过于完全，故心中充满对天地之爱，因而下不了手杀天地，继而回到了克雷的战舰。天地、阿重霞与鹫羽为了救回真魉呼，便乘着魉皇鬼追至战舰，但却发现美星以开打，于是天地与阿重霞便前去帮助美星，但却一起被困于战舰的迷宫中。鹫羽一人来到战舰之控制室与克雷谈话，而谈话中得知访希深知存在。之后零出现反叛了克雷，而克雷便启动自爆装置而逃跑，但被魉皇鬼所擒。战舰自爆后形成一黑洞，而快被吸入的天地、阿重霞与美星便靠着天地的光鹰翼而逃出。最后事件便在魉呼与零同化及美星送克雷回银河警察总部下落幕，而自此之后魉呼也变得温柔许多。

一个简短的“图画书”剧集（音乐和静态图片）预示了第三季OVA中的事件。 美星从GPHQ回来，带来了克雷博士的消息。鹫羽对魉呼进行了有趣的实验。在其他地方，访希深女士和D3对天地的兴趣与日俱增，并召唤了一位强大的战士。

接到银河警察神我人事件报告书的树雷皇室，陆续地来到了地球上。其中阿重霞与砂沙美的宝贝妈妈—美砂树把魉呼整得……，而遥照之母亲船穗王妃与遥照及鹫羽的谈话亦是『内藏玄机！』。树雷皇在要求阿重霞与砂沙美回树雷星不成下，便要天地与其所选之阿重霞的未婚夫—静龙决斗，就在此时，美星驾着宇宙飞船回来了，而其结果便是……，于是树雷皇便只有乖乖地回去了。但是，树雷皇最后在其船上说了一句话：「天地，以为我会轻易放弃吗？」故其未来会如何？谁也不知道……

回到昔日的校园，让天地回想起第一次见到魉呼时的情景，而此时此刻，学校的复建工作也早已开始。后来遇到上仓、池田，得知尼崎已转学到东京的高中，但他们两个却也紧追著天地家中那些外国美女的话题打转，目的就是想一亲芳泽…除此之外，还有鹫羽挟持天地想取精的过程，只不过鹫羽再厉害，仍然不是天敌美星的对手，最后在美星的突然出现下，采精的行动宣告失败。天地前去找父亲，刚好遇到铃亚，离开父亲的住处后，天地提及母亲的死因，虽然父亲没有正面回应，但也从谈话中得知铃亚的厨艺都是得自母亲的真传…然而最让天地吃惊的就是，突然出现的访客，那个人就是…

天地以为见到多年不见的母亲，于是热泪盈框，后来才知道是自己认错人，而眼前长得跟母亲一模一样的女性，则是自己的亲姊姊－天女。除此之外，姊姊还带来了自己已有未婚妻的消息，更扯的是马上就可以见面，只不过跑出来的是天地的奶奶－艾礼…这一连串的变化，让天地颇感吃不消，于是跑到田里去种田，没想到却因此遇到自己的未婚妻－诺伊可…

天地因为连续突如其来的骚动，再加上天气的变化，身体终于不支倒下，于是鹫羽交待天地必须静养三天，而诺伊可则是负责照顾他的工作，其他人虽然不服，却也莫可奈何。地球上的生活表面上看来并没有什么变化，但其他的行星却动作频频，颇有暗潮汹涌的感觉，而九罗密家的美咲生则是打算接美星回来，似乎又有战争一触即发的徵兆，此时的天地则是在诺伊可的邀请下，在环境与气氛都一流的大风吕泡澡，浑然不知即将暴发一场混乱…

美星的弟弟美咲生长大后，突然急著想把美星从地球上带回自己的身边，但是得知美星可能为了天地不肯离开地球之后，突然醋劲大发地想杀了天地，后来在玛西斯的晓以大义之下，总算让美咲生稍微冷静下来，但是天地的身边也因此又掀起了另一起风波…

美咲生在玛西斯的协助下，展开了利用邱比丸消灭天地的作战，但此举也引来了魉呼与魉皇鬼的不满和反击，整个作战行动似乎没有预期中顺利，包括被派到地球上的人还有玛西斯最后都不是魉呼她们的对手，甚至还因此被俘虏。然而砂沙美在和玛西斯交手时，看出玛西斯很喜欢美咲生，美星知道之后更是极力撮合，后来在鹫羽的主导之下，两人在不知情的情况下，众目睽睽地演出了一场爱情剧，最后美星的「亲热大作战」以圆满的结局收场。但是在这个时候，Z也具体地展开了他的复仇行动…

Z因为失去亲人的痛，打算向由津名魅等人所主导的高阶存在反抗，先除掉天地的存在，再逼津名魅她们让天地再生，这样历史就可以倒转，Z或许就不会承受失去亲人与肉体受创的痛苦打击。后来天地果然被Z砍了一刀，在鹫羽等人的努力之下，总算保住了天地的性命，也让历史得以重来…

天地在亚空间看到时间与空间的修复。天地们的因果受到保护时间回到最小限度的过去重新来过…那是正在执行美咲生和玛西斯的亲热大作战的高潮。美咲生因为这件事，被告知必需接受十年的义务活动。而美咲生则是要求带玛西斯一起随行。但可以义务活动只能带妻子及小孩随行…然后天地他们终于恢复正常的生活。而胜仁则是突然冒出来说：「有两件重要的事，第一件是关于你的母亲，清音的事情」…

Even with Nobuyuki and Rea's wedding coming up in a few days, the Masaki household, though busy with preparations for the wedding, their everyday situation is still par for the course for the Masaki house. In space too, people connected to the Masaki house are making preparations in order to attend the wedding. Airi is battling mountains of paperwork, and Funaho, who can't attend the wedding because the survival of Yosho hasn't been made public, gives her wedding gift to Minaho. A few days before the wedding, people connected to the Masaki house gather on earth and Tenchi meets his aunt Minaho. "...she reminds me of mom..." that's Tenchi's first impression, quite natural as she's also Airi's daughter. The scent of trouble is in the air...

At the lake house in Masaki Village, the preparations for Rea's wedding are in full swing. "I wanted to be married wearing the outfit that Kiyone-sama wore." With the thoughts for the late Kiyone being poured into her wedding dress, Akie, Kei, and the others continue the preparations. Meanwhile in space, Tennyo and Mikami watch over Airi working down the mountain of documents like a demon, all the while whining about missing Tenchi. Amidst all that, Minaho had reserved Tenchi for herself and spent all day with him, culminating in taking a bath together... "I'll give him back to you tomorrow, so please let me hog him for the rest of the day." Tenchi is moved by Minaho's semblance to his mother. The night quietly progresses...

One day before Nobuyuki and Rea's wedding, the women-only "Masaki Ladies' Assembly" gets together. With her wedding to Nobuyuki, Rea will finally be able to become an official member. Right after swearing her oath to the assembly, Rea's immediately asked about how her relationship with Nobuyuki began. Meanwhile in space, left behind by everyone, Airi worked all night to finish her work and tries to get to earth, but the transportation gate doesn't work and only spits out a recorded message from Washu.

On a particular day full of tension at the Masaki house, everybody is waiting for that moment. They are waiting for their new family member who will be Nobuyuki and Rea's first child and Tenchi's brother. With the entire Masaki family standing by, Tenchi's brother "Masaki Kenshi" lets out his first cry. But for Kenshi, this already marked the beginning of a heavy fate awaiting him. A few years later -- The women lead by Seto and Washu, and the men aiming to stop the women, lead by Juraian emperor Azusa and including the "Seto inhibitor" Seina, gather to discuss Kenshi's development. While the disquieting discussions continue, Kenshi's mother Rea makes a decision.

Though the destiny-laden life brings a lot of joy to Kenshi's mother, Rea, and Tenchi, the days are also tinged with worries. Next to the soundly sleeping Kenshi, Tennyo and Rea discuss Kiyone and other family matters until the day breaks. Then it's back to the usual "day in the Masaki family" again. Young Kenshi is not weighed down by any of the gloomy worries the adults have and grows stronger every day. Meanwhile, the adults on the side of the Yamada family are also starting to begin talking about the things to come...

Kiriko discusses making Earth a permanent home for Seina and his family with her group. Meanwhile, Lady Seto dispatches Kuis to charge Seina with overseeing a proxy war on tabletop island. Tenchi and the group arrive on the island and are greeted by Seina.

Sparks erupt, multiple balls of fire illuminate the emptiness of space, and amidst all that, there is "Tabletop Island". Due to the plan Kuisu devised, Tenchi and Shou end up having to deal with the pirates. Even though he was still not used to being in space, Tenchi works with Shou and the others to contain and ship off the pirates, despite having his doubts. One day, "Miron Pham" and "Fuku" visit the Masaki family. Miron explains that the plan is to anchor Tabletop Island on earth. She further explains that with the "Paradise War" being concluded and the island having become a floating paradise, the conditions are finally met to invite the Masaki Family there. This would be an ideal place to train Kenshi. Both Tenchi and Washu are taken aback by Miron's casual words. With all sorts of thoughts on his mind, Tenchi accompanies Kenshi, Ryouko, Ayeka, and the others to Tabletop Island. There, Tenchi will be doing some soul searching...

While Tenchi and Seina thwart another attack on the island, Kenshi continues his training.

A few years after the previous episode, Kenshi continues his training against Minaho, Funaho, Misaki and Seto among them. That evening, a large gathering from the Juraian royal family, other royals, the Kuramitsu family and Seina's family meet with Tenchi and the girls to hear Tenchi's decision.

Kenshi’s training continues. He’s now able to defeat the girls on Banjo Island, but still cannot do it quick enough. He’s still no where near good enough to hold his own on Geminar. As such, Seina’s harem takes over the training to get Kenshi to the next level. Further, Tenchi’s harem also joins in the training, including a pregnant Ryoko.