A cute story about a senpai and a kouhai… and much more.

Souma Akito, a young man, who dream of entering the woman underwear manufacturer industry for his love of female's breast by joining the tailoring club and acquiring the necessary skill to do so. However within the club there are sisters that will bring strangeness to our young man everyday life in more way then one.

High school sophomore **Shiraishi Kohei** has two girlfriends. One is **Aomi Reina**, cool and beautiful. The other is **Kurebayashi Yuka**, energetic and cute. He loves and cherishes them both deeply, and it's definitely not cheating—this is a **officially sanctioned two-timing relationship**! ...At least, for now. "Kohei-kun originally liked me from the start. My advantage is unshakable." "Sorry, but no! I overwrote that in a whole year!" Both girls love Kohei. And Kohei finds both of them irresistibly charming. That means whoever makes Kohei fall for them harder is the **true girlfriend**. In other words, it's a fierce clash of pride between Reina and Yuka! During class, after school, on holidays... Who will emerge victorious in this (?) fierce heroine race!? **A chaotic romantic battle of wits begins now!!** *Source: Sneaker Bunko*

Until death do us part... let's stay together forever, big sis! Otose Koito is a high school girl who fell into a coma after an accident while protecting her young cousin. When she wakes up, she finds herself in a world 10 years in the future!? Her cousin has grown into the adult woman she likes and is increasingly coming on to her - her sanity is at its limit with these exciting days!?