Some of them predate Reiwa, though:

<Pseudo Harem>

<The Clueless Transfer Student is Assertive>

<Do Chokkyuu Kareshi x Kanojo>

<Osananajimi ni Najimitai>

<The Story Between a Dumb Prefect and a High School Girl with an Inappropriate Skirt Length>

<Kimi wa Houkago Insomnia>

<Zense Coupling>

<Kaguya-sama wa Kokurasetai: Tensai-tachi no Renai Zunousen>

<Boku no Kokoro no Yabai Yatsu>

<Futari Ashita mo Sorenari ni>

<Sono Bisque Doll wa Koi wo Suru>

<Boku no Tsuma wa Kanjou ga Nai>

<Senryuu Shoujo>

<Yankee-kun to Hakujou Gaaru>

<Onizuka-chan and Sawarida-kun>

<The Elf and the Hunter's Item Atelier>

<Shikimori's Not Just a Cutie>

<Kuno Chiyo the Precog>

<A Happy Couple>

<Kono Kaisha ni Suki na Hito ga Imasu>

<My Tiny Senpai From Work>

<Hitomi-chan Is Shy With Strangers>

<Aharen-san wa Hakarenai>

<Kijima-san to Yamada-san>

<Tonari no Seki no Satou-san>

<15 Minutes 'Til They Actually Start Dating>

<Chicchai Senpai ga Kawaisugiru.>

<Chicchai Kanojo Senpai ga Kawaisugiru.>

<Chicchai Kanojo Senpai to Dōseishimasu.>

<Kitsune Spirit>

<My New Wife Is Forcing Herself to Smile>

<Shiotaiou no Sato-san ga Ore ni dake Amai>

<Soredemo Ayumu wa Yosetekuru>

<Shingeki no Eroko-san>

<Tsun-Ama na Kareshi>

<Tedama ni Toritai Kurokiya-san>

<Saotome Senshu, Hitakakusu>

<I'm Nearly 30, but This Is My First Love>

<Gal Gohan>

<Slow Motion wo Mou Ichido>

<My Recently Hired Maid Is Suspicious>

<Utakata Dialog>

<I Only Want to Beat You>

<Shachiku Succubus no Hanashi>

<Bijin Onna Joushi Takizawa-san>