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

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!?