1. Hiragana-sen, Aiu-eki yori (From Aiu Station on the Hiragana Line)
2. Shuuden ni wa Kaeshimasu (I’ll send her home on the last train)
3. Shoujo Planetarium (Girls Planetarium)
4. Ishuun no Asterism
5. Eien ni Shoujo (Forever Girls)
6. Otona no Kaidan no Shita (At the Bottom of the Stairway to Adulthood)

Another detective agency just opened in the same building as Ukai, and the new detective is his old high school classmate, who insists on helping Ukai despite his protest. His classmate has always been standoff-ish back in school, so is there an ulterior motive why he's showing up now?

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A new detective has set up an agency right next to Ukai's own and it turns out to be none other than his old high school classmate, Kondou aka Chikamichi.
Easily eluding all of Ukai's protests, Chikamichi by bit helps with Ukai's commissions until he starts to nonchalantly begins to stay around Ukai.
Back in high school,Chikamichi had placed a bit of distance,between Ukai and himself, which shocked Ukai a bit. What could be the reason for Chikamichi's reappearance in Ukai's life...?

1-5. Warudakumi ni mo Hana wa Furu
6-7. Senrozoi Hashiru.

From MangaHelpers:

Inudzuka is a teacher who has been caring on his own for his little daughter, Tsumugi, since his wife's death. He's no good at cooking, so they've been eating packaged meals from the convenience store. A series of events lead him one evening to a restaurant run by the mother of one of his students, Kotori. Her mother isn't there, but Kotori does her best to feed them both. It turns out that Kotori is often alone, since her parents are divorced and her mother is frequently not around. The three of them begin to meet and cook tasty food together. [tethysdust]

During a high school year opening assembly, Kaede is suddenly embraced by Nomiya, an underclassman transfer student. Nomiya reminds Kaede that they spent a summer together as children and proceeds to do everything in his power to re-enter Kaede's life. Kaede is still shaken by the death of his brother, who may have killed himself from the stress and anxiety resulting from an apparent case of gender dissociative disorder. Kaede is therefore reluctant to grant Nomiya the closeness that the younger boy desires, but, despite his confusion, the two end up becoming close friends - and then something more.

From JShoujo Scans:

With the ability to see the negative emotions of people, and to see it as if they’re monsters, whose character can be different and weird, she is Deng. Because no one can understand how she feels, a wall has been built around her heart. However, after living with her innocent brother and with the help with some good friends and Karas, the person that can consume evil intensions, her world has begun to change…

Kotaro has always admired the life of the “honorable outlaw” that he’s seen so often in the yakuza movies of his youth…and it doesn’t hurt that he’s set up to inherit his grandfather’s role as the local yakuza boss! One day, after witnessing the quiet florist, Toraji, capture a purse-snatcher single-handedly, he declares him the ideal Big Brother he’s always looked for in the syndicate. From that day on, Kotaro stalks Toraji at his flowershop, all the while falling in love. Toraji’s dark past, including a criminal record from his affiliation with the yakuza, has hardened his heart against relationships…but will the ever-doting Kotaro help plant the seed of love to blossom once more? (Source: Jmanga)

Other stories at Shuuden ni wa Kaeshimasu

Takes place 7 years after Seinen Hakkaten.

Though he seems completely indifferent to romance, high-schooler Manabu works part-time as a writer for an erotic magazine. One day, right when some classmates were about to pick a fight with him, he was saved by Yamaguma, an underclassman. Apparently Yamaguma, who is popular but unfamiliar with romance, is upset about his older sister working at a nightclub. While trying to desensitize Yamaguma of his excessive reaction to Manabu's erotic writing, they...? The heat of their connected hands is the folly of youth. A bittersweet diary of first love.

Kayano is a rich guy, who fell in love with a guy-Takao-he found injured. He pitied the guy and decided to ask him to give him tuition. That's when he realize that Takao has a terrible personality. Even so, he still had Takao as his teacher. Later, a misunderstanding happened and Kayano's mother thinks Takao is only after the money and made Takao leaves. Years later,Takao returns to the household again but as a lawyer who was hired by Kayano's parents over some stupid broken tea ware. Kayano tried to hit on Takao but was rejected because Takao has a wife now.

Natsu has never had a good relationship with her older sister, Aki, or her friends she always brings home. One day Aki brings home a girl that is quite a bit different than all the others and Natsu immediately likes her. When she overhears Aki and her friends talking about the new girl behind her back Natsu thinks, "If only she was my friend instead..."

Other stories at Shuuden ni wa Kaeshimasu