This story takes place a few years after Hoshino and Sudou have settled down together. Sudou's son Shouta is in high school now and so is his former classmate Daiki from elementary school. How has their relationship changed?

Tsuda and Endou have come to realize they can't stay the way they are forever. If asked about their relationship, they don't know how to answer. What do they need to stay together? It's not enough. They want more. They can't stop their feelings…

Masato, adoptive son of the Kuwabara household, has always been surrounded by prosperity… Until one day, the head of the family brings home a child named Kenta. Drowning as he is in the despair of having outlived his purpose, Masato still doesn't fail to notice the undue attention the master has started paying Kenta…

Every summer break, Kazu-kun spends a week with his beloved uncle Tetsunosuke, who lives in a mountainside village and works as a textile maker. Yuubae ni Niji is the story of their colorful days.

Short extra chapter about Tsuda and Endou from Endou-kun no Kansatsu Nikki.

By chance of fate, Godai met Mr. Yasuda, a rather pretty man, on his first delivery assignment up at Yamanoue Research Facility who greeted poor Godai with a beaming smile. Then the next day, was Mr. Aihara’s turn to receive parcels too. Only… he looks just like Mr. Yasuda. What the hell’s going on?! Never having anybody treat him so kindly before, Godai’s determined to get right down to the bottom of this!

When city slicker Aida Torajirou suddenly collapses on the side of a country road due to a heat stroke, he's rescued by the son of a local hair salon owner. With nearly unknown background information, apart from being from Tokyo, the young man doesn't want his father to call the police on the stranger; but instead, the salon owner takes interest in Tora-san and offers him a job.

A compilation of original doujinshi by Hayakawa Nojiko set in the same universe as her previous works.

The story of a quiet, sensitive high-school guy who enjoys painting, and his complicated feelings.

The story of a watchmaker's grandson and a regular, who always takes the same pocket watch for repairs.

Because of changes in seating arrangements, high school student Tsuda ends up behind the quiet and expressionless Endou. Their interactions are born from a trivial incident, and he begins to see a side of Endou that he has never gotten to know before. That mole, slender nape, and soft hair. The subtle faces that he makes and little changes in his attitude. But Tsuda, who used to be indifferent about others and never made any deep connections, now feels impatient about the distance between Endou and himself. What on earth is drawing these feelings?

It's been a while since these two appeared, but from the next one they'll pass on the baton. Note, an updated version is included as an Animate bonus for the new edition of Kurayami ni Strobe.

Spin-off of Kurayami ni Strobe featuring Sawayama & Hase.