(with T. Nakamura) Remarks on double zeta values of level 2, J. Number Theory, 133(1) (2013), 48--54. (link, author's version)
(with S. Yamamoto) On some multiple zeta-star values of one-two-three indices, Int. J. Number Theory, 9(5) (2013), 1171--1184. (link)
(with M. Kaneko) Double zeta values, double Eisenstein series, and modular forms of level 2, Math. Ann., 357(3) (2013), 1091--1118. (link)
(with K. Imatomi, T. Tanaka, N. Wakabayashi) On some combinations of multiple zeta-star values, Acta Humanistica et Scientifica Universitatis Sangio Kyotiensis, Natural science series no.42, (2013), 1--20. (link)
On a conjecture for representations of integers as sums of squares and double shuffle relations, Ramanujan J., 33(1) (2014), 1--21. (link, pdf)
(with M. Kazalicki, Y. Sakai) Modular parametrizations of certain elliptic curves, Acta Arith., 163(1) (2014), 33--43. (link, author's version)
(with M. Hirose, N. Sato) Eisenstein series identities based on partial fraction decomposition, Ramanujan J., 38(3) (2015), 455--463. (link)
Multiple zeta values, multiple Eisenstein series, and period polynomials (a research announcement in Japanese), RIMS Kôkyûroku Bessatau, B53 (2015), 199--218. (pdf)
On linear relations among totally odd multiple zeta values related to period polynomials, Kyushu J. Math., 70(1) (2016), 1--28. (pdf)
(with H. Bachmann) The double shuffle relations for multiple Eisenstein series, to appear in Nagoya Math. J. (Published Online)
(with S. Kadota, T. Okamoto) Evaluation of Tornheim's type of double series, Illinois J. Math., 61 (2017), 171--186. (link).
(with M. Kazalicki) Fourier coefficients of modular forms arising from certain modular parametrizations, in preparation.
(with D. Ma) Relationship between multiple zeta values of depths 2 and 3 and period
polynomials, preprint arXiv:1707.08178.
(with M. Hirose, K. Iwaki, N. Sato) Duality/Sum formulas for iterated integrals and their application to multiple zeta value, preprint arXiv:1704.06387.
(with H. Bachmann, Y. Takeyama) Cyclotomic analogues of finite multiple zeta values, preprint arXiv:1707.05008.
(with D. Ma) On totally odd multiple zeta values, in preparation.
Periods; Multiple zeta values (MZVs), Iterated integrals, Periods of modular forms
Related topics on MZVs; Broadhurst-Kreimer conjecture (double shuffle Lie algebra, depth-graded motivic Lie algebra), Kaneko-Zagier conjecture (finite MZVs, symmetrized MZVs), Colored MZVs, Zeta functions of root systems, q-analogue of MZVs, Multiple Eisenstein series
Modular forms; Elliptic modular forms, Harmonic Mass forms, Quantum modular forms
Period polynomial relations between double zeta values revisited, Modular Forms and Period Integrals, University of Tokyo (Japan), Sep. 12--14, 2016
A refinement of period polynomial relations between double zeta values, 8th international symposium on natural science (2016), Incheon International University (Korea), Nov. 3, 2016
Comparison between cuspidal generators on the depth-graded motivic Lie algebra and on the linearized double shuffle Lie algebra, Number Theory Lunch Seminar, Max Planck Institute for Mathematics (Germany), Sep. 20, 2017
Totally odd multiple zeta values and periods polynomials, Trimester Seminar on ``Periods in Number Theory, Algebraic Geometry and Physics", Hausdorf Research Institute for Mathematics (Germany), Jan. 30, 2018